Everyone else has given many ideas on the various shooting accessories you may need, so no need for me to give another list.
One thing you may want to do is go onto You Tube and search for muzzleloader shooting. There's some decent, well-done videos describing the shooting of traditional muzzleloaders (of course you have to sort through all the garbage to find that golden nugget). In addition, CVA has a video called "Successful Muzzleloading" that covers shooting Flintlock, Caplock, and those other kind we don't discuss here. Roger Raglin has a hunting video called "Black Powder Magic" that has a very good segment on working up a load with a caplock and has a lot of hunting in it. You can find that video by searching for Roger Raglin on the web. I'm sure there are many others, but these are ones I've seen.
Since I had absolutely no one I knew that did muzzleloading (much less traditional muzzleloading) I also purchased a couple of books and thoroughly read them before I even bought my first gun. I found Sam Fadala's "The Complete Blackpowder Handbook" an excellent reference.
Unfortunately I don't think this site existed then. This is certainly an excellent place to get help as well, as you've already found! Sometimes, though, seeing is a good way to get a better feel for what may be needed and how it is used.