From Oprah Winfrey to Steve Jobs to J.K. Rowling, entrepreneurial success stories are the stuff from which American dreams are made. Much like these famous names, the six self-made millionaires we're profiling have one thing in common: Thanks to hard work, determination and sound advice from mentors, friends and family, they've been able to build thriving businesses from the ground up. The rise to the top can be bumpy. In fact, some of the entrepreneurs we talked to were homeless during the early years of their companies. That's why they all agree that it's important to help others in need. All, including Radio One's Catherine L. Hughes and Life is good co-founder Bert Jacobs, give back to the community by volunteering time, donating to charitable organizations or running their own charities. Learn how these six diverse entrepreneurs -- from a t-shirt designer to a media mogul -- turned meager beginnings into multimillion-dollar success and what advice they offer to budding business tycoons who hope to follow in their footsteps. Catherine L. Hughes Courtesy of Radio One Age: 64 Occupation: Founder and chairperson, Radio One Advice to young entrepreneurs: "Sometimes the ones who love you the most will give you the worst business advice." By conventional standards, Hughes wasn't destined to build a successful multimillion-dollar media company. She was a teen mom by 16 and a high-school dropout. However, she later completed high school, followed by brief stints at area universities in her hometown of Omaha, Neb. Despite her limited formal education, Hughes, who credits publishing legend John H. Johnson as one of her mentors, worked her way up at Omaha's KOWH radio starting in 1969 before heading to the nation's capital to become a lecturer at Howard University. In 1975, she became general manager for the university's radio station, WHUR-FM. By 1979, she bought her first radio station, WOL-AM in D.C., with her then-husband and founded Radio One a year later. Those early years were rough. Hughes, who was divorced by then, slept with her son on the floor of her radio station because she couldn't afford to live anywhere else. "My mother tried her best to talk me out of the radio business because of that," Hughes recalls. It's for this reason that she advises young entrepreneurs to be wary about who they divulge their challenges to -- even family. "If I had listened [to my mother], I would be a government employee right now and there would be no Radio One." Thirty-two years later, in addition to the radio company, Hughes' empire includes her television network TV One and several interactive ventures, including NewsOne.com and HelloBeautiful.com. Her charitable efforts include serving as a board member and the main benefactor for the Piney Woods School, a boarding school located in Piney Woods, Miss., that serves students from financially strapped families. Bert Jacobs Courtesy of Life Is Good Age: 46 Occupation: Co-Founder and CEO, Life is good Advice to young entrepreneurs: "Try to shoot for a timeless business." You've probably seen the beret-wearing, smiling face of "Jake," the Life is good logo, on the company's tee shirts and products. Co-founders Bert Jacobs and his brother, John Jacobs, 43, started peddling their tee shirts on the streets of Boston -- going door-to-door at college dorms and sleeping in their van to save money -- in 1989. It would take nearly six years, however, before their shirts finally caught on with consumers, thanks to "Jake." The logo, which is infused with optimism, was created after a conversation about how the world was slammed with constant negativity. It became an instant hit. Now, the New England-based company has revenues in excess of $100 million, and each year more of it goes toward their charity, Life is good Kids Foundation, which helps children overcome life-threatening challenges. "In the beginning, we made every business mistake in the book," says Bert. The brothers didn't have a business plan or growth strategy -- a formula for disaster, if you go by what's taught in business school. Bert credits part of their success to listening to their friends and customers as informal focus groups, rather than "experts." He advises budding entrepreneurs to: "Try to shoot for a timeless business that will work through good times and bad." Ali Brown Courtesy of Ali Brown Age: 40 Occupation: Entrepreneur, business consultant and publisher, AliBrown.com Advice to young entrepreneurs: "It's important you seek out other business owners for information, advice, support and resources." Fed up with her dead-end job at a New York City ad agency, Brown decided to quit in 1998. Armed with her brother's hand-me-down computer, she launched her first marketing agency, AKB Communications, from her kitchen table. While having her own business was exciting, the uncertainty of self-employment had its challenges. Brown remembers all too well maxing out credit cards and draining her bank account to stay afloat in the early days. One night in particular, she tried to withdraw $20 from an ATM but was denied because her balance was only $18.56. Thirteen years later, thanks to her hard work and perseverance, Brown has achieved many successes: She earned her first million before the age of 35 and has appeared on ABC's reality show "Secret Millionaire," where she donated money to several organizations. She still actively supports three of them. When it comes down to deciding if entrepreneurship is the right move for you, Brown says, "Entrepreneurship isn't for everyone. Every definition of entrepreneur I've found includes the word 'risk'." For those who are willing to take the leap of faith, she advises: "It's important that you seek out other business owners for information, advice, support and resources. Today, would-be entrepreneurs have the Internet and social media, and it's a great place to get started learning more about how to grow a business." Jill Blashack Strahan Courtesy of Jill Blashack Strahan Age: 52 Occupation: Founder and CEO, Tastefully Simple Advice to young entrepreneurs: "Having goals is absolutely critical." For Strahan, starting her multimillion-dollar company, Tastefully Simple, a direct sales retailer of specialty food products, began with "a dream and a shoestring." She grew up on a dairy farm in Minnesota and later started selling gourmet food baskets, which inspired her business. In the beginning, the entrepreneur fed her fledgling company with $6,000 of her own savings and some loans from a friend and the Small Business Administration. Strahan's first headquarters was a 1,200-square-foot space with a concrete floor and no running water. Early orders were packed on a pool table. Today, the Tastefully Simple offices take up nearly 200,000 square feet on a 79-acre lot. In addition to running a company that's valued at more than $100 million, Strahan finds time to give back to the community. Tastefully Simple has donated more than $5 million to local causes, and in 2009 teamed up with Share Our Strength, a group that seeks to end childhood hunger in America. If you're an entrepreneur with a good idea, she says to remember that there isn't an easy road to building a profitable business: "The secret to success doesn't involve pixie dust or a magic bullet. Having goals is absolutely critical." Farrah Gray Courtesy of Farrah Gray Publishing Age: 27 Occupation: Founder and CEO, Farrah Gray Publishing Advice to young entrepreneurs: "Keep your business small . . . niche yourself." When most 6-year-olds were worried about what time their favorite cartoon came on TV, Gray was already an entrepreneur. He was going door-to-door in his inner-city Chicago neighborhood selling hand-painted rocks as bookends to help his ailing mother make ends meet. "I can remember being very young and my mom having a heart attack. I wondered how we were going to pay the bills and thought to myself, 'I don't want to be poor like this anymore,'" he recalls. Trying to figure out a way to improve his family's home life sparked something big: By the time he was 17, Gray had founded and operated several businesses, including Kidztel, a prepaid phone card company, and Farr-Out Foods, a food company targeting young adults, which grossed $1.5 million in sales before he sold it. At 20, his first book, "Reallionaire: Nine Steps to Becoming Rich Inside and Out," was published. Now, Gray's focused on his latest venture, Farrah Gray Publishing, a boutique celebrity book publishing house he started in 2009, which includes titles such as "Transparent" by CNN's Don Lemon. Gray also spends his time contributing to charitable organizations, such as the National Coalition for the Homeless and the National Marrow Donor Program. For anyone considering starting a new business, he suggests keeping things small: "A lot of times we get caught up in trying to be the next Facebook or Apple. That isn't necessary -- niche yourself." Jesse Conners Courtesy of FirednFabulous/YouTube Age: 28 Occupation: CEO and founder, PeppermintPark.com Advice to young entrepreneurs: "There is constantly some fire that you have to put out . . . Don't let it discourage you." Conners had an unusual childhood: When she was 9, her parents joined a cult and -- believing that the world was about to end -- sold all of their worldly possessions. From then until she was 18, Conners traveled across the U.S. and to Mexico with her family, following the cult's message and searching for work along the way. As unconventional as it was, she says her upbringing spurred the independence she needed to succeed in business. While in high school, she started doing the marketing for her father's chiropractor practice, which eventually led to a job in real estate. At 21, she auditioned for and was cast in the first season of NBC's "The Apprentice." Although Conners didn't win, her stint on national television landed her a job on the real estate speaking circuit. In 2008, she began building PeppermintPark.com, a membership-based fashion and luxury brand online retailer. The Web site has been up and running for a little over a year and has a ten-person staff. Earlier this year, Conners's "outside the box" approach to business helped her to surpass a $1 million net worth. In addition to running her company, she has offered charitable support to Elephant Human Relations Aid and provides resources to women who are victims of domestic abuse, according to her Web site. Conners advises budding entrepreneurs to be aware that daily obstacles are the norm, not the exception. "There is constantly some fire that you have to put out. That's what running a business is all about," Conners says. "Don't let it discourage you. Try again, start again."