Nate, welcome. Rich has just given very solid advise. He has the years and skills to back it up. You wont be rich working on guns, but if it is your passion, that will get old also dealing with the public, (Sorry Public). The only advise that I can give is to never forget, that is your name on that work. If you have the pride in your work, and you will have to stand behind your work, again because it is your name. You will run into those folks that know more than you do, and there will be nothing you do that you could satisfy them. Guess what they will work on smearing , your name. There has been a lot of folks that had the talent that started in the gunsmith business and produced good work , until the greed hit, meaning they tried to do it cheaper for higher profit. My first grip that I ever done was the same as the last grip that I done when I quit doing them. You will learn to work faster and more efficient, but don't scrimp on your quality.
Only you will be the first person that will destroy your good name. Keep the pride, enjoy what you do, and you will make it. Good luck.