Go for it and good luck!!
However, if you plan to work for yourself, you will need an FFL. Also, gunsmithing is no different from any other business. Some good resources for this information is from SCORE (Service Core of Retired Executives). You can find them through your local Chamber of Commerce. They will meet with you, and assign someone who has experience with the type of business you are planning to enter into. (Probably not a gunsmith, though). They will give you stacks of publications about legal requirements for businesses in your location. They will also help you write a good business plan. The great part about them is it is a free service (if you don't consider our taxes). The other necessary requirements you can get from BATF.