Many people on here act like it takes a great deal of technical knowledge to shoot a muzzeloader correctly, but it does not. Before we dog out certain stores or what not, just ask yourself...can I research the information myself? And the answer is, you already have the information with the purchase of your weapon. The next thing is to simply drive to the nearest store that carries the equipment you need. Buy the equipment and then shoot your gun.
When I first started shooting a muzzleloader I drove down to Walmart, picked up the .50 cal bullets, the proper blackpowder charge, and the percussion caps. Then I shot the gun just fine. I would not waste my time driving 50 miles one way if I could drive 5 miles and get the stuff I needed. The people at those gun shops aren't going to give you anything more than the stuff you could find at DICKS or Walmart.