Welcome to the group! Good advise posted above. Since you're new, let me nudge you in the right direction. In a rifle, you use patching or patch material when loading balls...in a smoothbore, you use wads under the ball, just like a shotgun. It's a lingo thing.
When I buy a new rifle, I try one patching material and several sizes of balls. If that fails, then I try different materials. The reason is that I shoot several rifles and wanted to keep the same material for all of them. It has worked out pretty well for me as I use pillow ticking for all my rifles. Try different patch lubes until you find the one that works best in your gun/load combo. I have also found that after a few years of continuous shooting, the barrel changes and I may have to tinker with patch/lube/ball combos until things settle out again.
I posted a message about flintlocks some time ago, specifically what to look for when buying flints. Since a rock is the heart of your ignition system, it's the most important part. If you need direction on flinters, drop a line or ask the board. These guys are great!
Have a great time and relax...it's a hobby.