Welcome from the Oregon Territory! Many years of knowledge and experience are among our Ranks.
I’m not sure what’s available around you. You may be forced to order Online.
I started down this path over 30 years ago. I bought my first rifle used for $150. I then had to go to the Muzzleloader Shop and spend another $50 to $75 to shoot it!
Things you’ll need:
Round Balls
Shooting Patches
Cleaning Patches
Short Starter
Powder
Caps or Flints, as others have mentioned, there’s a shortage of caps.
Capper or Flint Wallet.
Lube (liquid or solid). Some liquid lubes are also cleaners.
Powder Horn or Flask to keep your powder in.
Accouterments: Cleaning Jag, Ball Puller, Breech Scraper, Bore Cleaning Brush
Many of us use a longer Cleaning, Loading, Bench, or Range Rod. Leave the one under your barrel for "looks" and hunting.
I would highly recommend joining a local Muzzleloader Club if you have one around. There’s also the National Muzzle Loading Rifle Association which has Carter Clubs in your state. Many here are members. The full-color monthly magazine is chock full of info and entertainment!
The NMLRA Charter Club Program — The NMLRA
Good Luck and heed my warning!
Walt