When/if you decide to go into business, take a small business course at a local school, like a community college. Learn at least a little about how to run a business. Believe me, the gunsmithing part is easy compared to knowing all the ins and outs of actually running a shop and making money. Think an FFL is all that is needed? How about a business license, sales tax license, zoning approval, etc., etc.?
And line up some capital, your own savings or investors'. I know some guys think all they need to be a gunsmith is a book, a file, a screwdriver, and an FFL. Get a Brownell's catalog and check the prices of even the most basic tools. Look at the price of even chambering reamers and headspace gauges. Then check the cost of machines - lathe, miller, drill press, grinder - that you will need to do a job right. Doing bluing is another headache, with all the OSHA rules about ventilation, hazardous chemicals, etc.
Some folks have accused me of trying to discourage new gunsmiths. I think that if simply pointing out some real-world problems discourages them, they cannot have been very determined. I have seen too many people who tried to convert a hobby into a business start up with high hopes, only to founder on the problems and economics of doing business. One I heard of saw no need to keep books, get a business license, pay estimated income tax, or worry about state sales taxes. His "business" lasted less than six months before he went bankrupt and almost went to jail.
Jim