One other thing you might want to check into is liability insurance for the products you build. Insurance and putting up with customers who want everything done for almost nothing and taking forever to pay is one of the reasons I am back to building my own, one or two at a time, and selling them as done units. If you're making money doing it in your parents garage, build your own 3 or 4 car garage and keep doing it on a part time basis until you have the bucks to go big time.