Flintlocks are amazing. No fast follow-on shots, but lots of fun, whether hunting, plinking, or target shooting.
There are a lot of tips, tricks, and little things one should learn along the way. Are you a member of a club or range where there are other flintlock shooters?
Of course you can ask questions here, and read through the older threads, but for a proper introduction, you'll benefit from going through the whole process from beginning to the end.
There are a number of decent books available for little cost. Sam Fadala wrote numerous books on muzzleloading geared toward those new to the hobby/sport. I think his last book was published in 2006. You can probably pick up one from eBay or used from Amazon for just a few dollars. The advantage is many of his books take the reader from knowing nothing to safely enjoying muzzleloaders, from A to Z. When I first started in 1990, I relied heavily on his books. They are well organized, and I could skip over parts not relevant to me at the time, but go back later when blackpowder cartridges became important to me.
If you prefer videos, there are a number of blackpowder and muzzleloading channels on Rumble, Odysee, and a few survive on YouTube. Ethan
@ILoveMuzzleloading produces a number of videos geared toward those just entering the hobby. Another favorite of mine is Mike Beliveau
@duelist1954 -- he has some fascinating build videos, history videos, and he also has some videos where he goes through everything in preparing a gun, loading, shooting, cleaning, and routine maintenance.
A word of caution about some videos though: not all content creators are equally qualified, knowledgeable, or giving good advice. It's free content and some of it is worth what you pay for it.
Depending on your budget and aims, you might find this forum offers some very good deals. To my regret, I spent more on factory production rifle in 2022, which is okay, only to have recently seen several much nicer rifles pass through the for sale section here for less money. Live and learn.