If you’re one of the courageous people who have thrown off the yoke of working for the man and decided to start a business of your own, you’ve undoubtedly wrestled with the question of who your customers are. Just who will buy your services or products? Are they men or women? What age groups do they represent? In short, who are you trying to reach? The answer of course, defines your niche. According to the U.S. Small Business Administration, there were 28 million small businesses in 2010. More than three-quarters were non-employers, meaning they are owner-worker shops. They’re freelancers of every variety. Baby sitters, dog walkers and marketing specialists. They’re…