I don't want to discourage you, but rather pass on some experience. Making your hobby , your primary source of income can ruin it as a hobby. In the knife and firearm business there are well connected people with a lot money invested in it that will use those connections and wealth to put every barrier they can in your way no matter how small and insignificant you might think your business is.
Having said that, being your own boss is the most gratifying and rewarding thing you can do, go for it!