I will say this again, in an abbreviated form.
If you want to go into gunsmithing to work on other people's guns for money, in other words if you want to go into business, first learn how to run a business. Believe me, that is a lot more complex than learning gunsmithing. Learn all the multitudinous local, state and federal laws that regulate business (gun laws are small potatoes), including taxes, safety, zoning, etc. Know that you can obtain insurance at a reasonable cost (the alternative is bankruptcy if something goes wrong or a fire destroys someone's $100 grand English double gun). Learn about bookkeeping and accounting; you might hire an accountant but you need to give him/her the necessary information.
Find out if and where you can set up a shop. Don't use your house, even if it would be legal.
Find a source of financing. With even simple reamers running $65, the costs of equipping a shop mount up very fast. If you can buy into a going establishment, or find a smith who is retiring, that may be one way to go.
Jim