Here are my suggestions to buy your first flint gun in order from the best way to start at the top of the list.
1. Buy the best Used or New gun you can afford. That way you won't be frustrated with poor quality stuff, that will have to be fixed before the gun works correctly. You will also HAVE a gun to shoot and you can take more time to decide how you are going to get your NEXT gun. :grin:
2. For most people, I think the best next step is buy a completely assembled gun that needs the wood and metal finished. This requires the least amount of tools and experience and will give you some idea if you want to pursue doing more difficult work. It will also give you a chance to learn disassembly and assembly of the parts. The real plus here is the lock, barrel and trigger will be in the proper positions to function correctly. IF you decide this is all the further you can or want to go, you have a functioning gun. It will give you pride of ownership when you do a good job of finishing the wood and metal.
And now a few (rather a bunch of) words on kits:
A. I have forgotten how many unfinished kits I've seen people buy, get frustrated with, and never complete; since I completed my 18 month Apprenticeship in 1974 to build and work modern guns. Many folks wind up having somebody else finish such kits, if they ever get the kit finished at all. That can and will sometimes/often cost more than an already completed gun.
B. You will not save ANY money if you buy all the tools and books needed to build a kit into a complete gun. Actually, it will cost you more than buying a similar quality complete gun. I suggest you only go this route IF you think you want to build more than one kit and go even further.
C. A real problem on some kits is once you get the barrel and tang inlet, the lock may need to go back further to align with the breech and vent hole, than what is allowed by the Lock Panel. So the best advice is TRY to buy a good kit that has all the parts with it. Oversize lock panels are better than ones that are shaped down a lot in a kit, especially on the first kit/s you assemble. A lot of people recommend Jim Chambers' complete kits as a good kit to begin with, though there are other good ones out there.
D. There are people who will inlet a barrel for you. Some will drill a ramrod hole for you. Some will do these things and inlet the lock and do other work as well. There is no shame in having someone do the work on a kit that you don't feel comfortable doing.
E. PRACTICE cutting dovetails on a piece of scrap barrel or metal before you do it the first time on a barrel. Dovetailing the barrel lugs is the next step and if you mess up a little, it will covered by the forearm of the stock. Save the sight dovetails for last, after you have some practice doing them.
One important final tip on some of the "Factory Made Kits." I am referring to many of the kits that were made in Italy over the years. It used to be common practice that when a stock wasn't inlet or cut just right, rather than throwing it away it went into the kits. When something was a bit wrong with the Lock, or barrel or other parts, they went into kits. I am not sure if they have stopped that common practice in the last 10 to 15 years, but don't be surprised you get something like that in a "Factory Kit." Oh, I believe there is a special place in the Underworld for those who sold BP Revolver Kits and especially the "Brass" Frame BP Revolver Kits, when those kits were not pre-assembled and fitted. Those kits may not have been impossible to fit by someone who was really expert on fitting and assembling revolvers, but they were close to it.
Gus