Silver Creek Slim's list is a good one - and contacting the 'formal' schools is a good idea if you're serious.
Be advised that the 'good' schools require attendance, since your grade will be something that you build from scratch - doing the bedding and checkering, the headspacing, crowning, metal finish - and everything else associated with actual gunsmithing.
You'll learn metallurgy, welding/soldering, theory and a number of those disciplines that will allow you to build and repair firearms safely.
CAS 'gunsmithing' in many cases amounts to swapping out springs, and polishing of internals - it's not that hard to do, if you're careful - it's merely time-consuming.
Once you get yourself settled - if you can't give the time needed to attend a resident course - see what courses you can take locally involving welding, machining and metallurgy.
Those are very 'key' to the profession - as is metal finishing in all its many variations.
Perhaps a large shop with an actual trained gunsmith may be willing to teach you on an unpaid 'apprentice' basis.
A lot of guys learn that way - by doing - and then, they figure out the time that they can take a more formal course, once they've bolstered their skills.
You may be thinking about specializing in C&WAS firearms - but you'll be surprised at how few folks in the average community will have those weapons.
What they will have, though are commercial shotguns and rifles that need 'something' done - especially before hunting season - and if they know that you work on guns - they'll be coming to you.
Turning away a Winchester Model 12 that needs a new rib and refinish because you want to work on something 'cowboy' is not financially smart, and unless you build competition Trap guns or Match rifles - and have a reputation for building good ones - 'niche' gunsmithing isn't lucrative.
Best to know more about them all, serve the shooting community, and promote C&WAS through your shop and the quality of your work.
If you're conscientious, and can give prompt service - you'll get ample opportunity to work on those weapons you really like, since your reputation will spread.
Good Luck.
Vaya,
Scouts Out!