You have received much advice. Much of it I'd call intermediate level. Also, if I were a new bee reading it I'd be confused. Somebody needs to write a long post in simple words and sentences explaining step by step the art of the flintlock. Boone (an in-law of mine) and Crocket may have found flintlocks good enough, but they had no choice. They also had knowledgeable mentors, like dads, older brothers, uncles and neighbors to teach them.
You do have a choice, either flint or percussion. Flintlocks are rightly called flinchlocks. You can easily develope a flinch with all that fire and smoke right in your face. A cap lock likely won't cause such a flinch. A flinch will ruin you as a shooter; even as a machine gun shooter. I advise starting with a percussion and developing good shooting and loading skills first.
Start with an assembled rifle, not a musket. Get something like a Thompson Center or Investarms Hawken or one of the many copies. These rifles are called Hawkens, but aren't true Hawkens in the strictest sense.
Caps can usually be found at Graf and Son or MidwayUSA. I buy 1,000 at a time. I have a thousand each of #11 and #10 that weren't hard to find online. Likewise, get real black powder. Easy to buy online. Buy several pounds at a time to defray the hazmat fee. Some dealers will cover the fee themselves, saving you money.
I get what you mean but I disagree about modern “Hawkens”.
TC.....
The truth is they are absolutely miserable in stock shape. They are made for a scope.
If you want to develop a flinch,.....
Shoot a Renegade with 90 grains and a maxi ball. Flint or percussion it does not matter. That joker is going to thump you.
TC flintlocks....
Mediocre at best. They were good in their day much better than the CVA Maslin flintlocks but the CVAs were horrible. Functional but horrible.
Now the TC flintlock is an orphan. It might as well be Goulcher from 1839.
Used and abused.......
TCs are getting old and many look good but have bores like sewer pipes. Part of that was marketing. Namely Pyrodex marketing.
Traditions......
Jukar and CVA still live.
They are better than nothing.
That are way overpriced for what they are.
A basic Traditions offering is 1/2 or 3/4 of the way to a Woodsrunner or Bess kit.
In a lot of ways, a Traditions Kentucky kit is harder than building from a blank. It’s quicker, but even a seasoned builder will have the same struggles a novice would.
Sometimes they do not want to go together correctly.
Ivestarms/Lyman/Great Plains/Gemmer/Bridger/ whatever they are this week.....
Great Guns. I love them.......
In percussion
In flintlock.... nope.
L&R replacement locks for TC and others.....
Yep, let’s replace an old mediocre lock with a brand new mediocre lock.
Used guns.......namely Longrifles
You might get lucky
You might get a piece of junk poorly built. The catch 22 is you really have to be experienced to judge a “bargain”.
Many of these bargains are not.
There are some low cost builders who build junk at bargain prices.
When I think about these guys and their guns......
I puke in my mouth a little.
The ergonomics of 18th Century stock shapes are far far above the modern stuff.
For me, nothing feels as sweet as shouldering an American Longrifle or English gun like a Bess.
With care the Woodsrunner or Dixie/Pedersoli Bess can be assembled on the kitchen table.
There’s plenty of support for the Kibler. Jim has a slew of videos posted.
There’s an awesome history lesson with a Longrifle or Bess. It’s just not there with the TC and it’s clones unless you are into disco, bell bottoms and leisure suits. Yet they are.....
“Staying Ali——veeeeeee Ive. Staying Alive.
The Bess was designed for criminals, the dregs of society and street urchins to master.
With a loaded cartridge box, 2 opposing teeth and an intellect slightly above plant life a Bess can be mastered.
The Pedersoli Bess with it’s great lock would probably shoot with railroad gravel.
Here’s another thing.....
Lower priced flintlocks can set up the user for failure.
In the lower priced market....
Go percussion.
India Guns.......
I hear stamp collecting can be a great hobby. Bird watching can be rewarding as well.
For a person starting out.....
They need to start with the good stuff....
If at all possible.