cap and ball shooting is made awesome by the following basic ingredients:
Pistol, Musket/Rifle and/or shotgun- Combine as few or many of any variety or time period to fit your taste.
Powder- Many choices available; experiment brands, types, and volume.
Primers/Flints- You will eventually begin buying bulk packages to save trips to the store.
Lead ball/ballets/Bullets and half-ball conicals- These are the required instruments, in your choice of various sizes/calibers(a .15 larger than chamber diameter for safer seal in revolvers), weights, and hardness levels to put holes thru targets such as paper, pie plates, plastic jugs/ aluminum cans, wild game etc...
Pour powder into chambers/bore in measured amounts. Be sure to not exceed safe volumes of powder in your particular firearm, this is a saftey concern. Top with lead projectile(plural in shotguns). Be sure projectile is firmly seated against powder charge or catastrophic loss of fingers and eyeballs may prevent you from trying this again. This should be sagfe and fun, not lethal to the shooter or by-standers.
Prime with either percussion cap or sparking powder depending on your gun(cap-lock Vs Flint lock), cock, aim, squeeze trigger. Repeat as many times as desired or until cleaning is required to ensure smooth function of gun.
If I've forgotten anything major, I'm sure others will fill in.