Are you at least 18 yrs old? Reason that I ask- (a) I can't look thru the computer and see you, and (b) the components of most hot bluing salts are caustic as hell- will eat the skin right off you if you are not careful with them. So they do not sell to minors.
Outside of that, there is no license/ password/ secret handshake. If you want to try your hand, couple of things to remember-
Metal prep and polish are a gotta do. Bluing does not cover pits or scratched metal. 90% of the work is polishing. Doing so without rounding over sharp edges or dishing out screw holes is the hard part.
Do not hot blue things with soldered parts- like double barrel shotguns. Bluing salts will attack the solder. Do not blue things that are not steel, the salts will dissolve aluminum. Do not blue late model Winchester lever actions- wrong alloy- either will not blue, or will turn purple.
Degrease- and then do not touch with bare skin- before bluing.
You need a bluing tank, and a boiling water tank, and source of heat. Do not let any water hit the bluing tank once heated- you will get an explosive spatter of caustics.
Wear GOOD eye and face protection.
I have done a few blue jobs- mainly to see if I could- and they turned out well. But with the cost of chemicals and equipment, for a one time, you will likely be much better off finding a good smith that does good bluing, and pay him.
IF you decide to go forward with this, why not do a writeup for the others here, and include a few pictures?
What we have here is... failure- to communicate.