Whoo! WAY too much to put in a single answer! First, would find a good book- perhaps one of these- Amazon.com: muzzleloader: Books
and would check for fellow BP enthusiast at any local ranges- or re-enactors in your area.
Yours should be a smoothbore- you will be shooting patched round ball. Use ONLY black powder, or a legit BP substitute. Ones like pyrodex ARE a bit harder to ignite than true black powder.
Clean up- hot water and dish detergent. Get your own bottle of Dawn so you lady does not fuss at you.
Accesories- yes, one or two wheelbarrow fulls. Touch hole pick, bullet puller, worm (retrieving a patch that went down the barrel, powder measure. GOOD EYE PROTECTION IS A GOTTA HAVE.
Rolling cartridges can be fun, but wait a bit, and hand feed for the start. I use a dowel close to bore diameter, roll around that. Cartridges have been rolled out of every paper you can think of including newspaper. I use double-wider cigarette papers.
There are 2 kinds of BP shooters- those that HAVE screwed up, and loaded a ball with no powder, and those that WILL at some future time. Accept it when the time comes, learn to use bullet puller.
2 points and I'll shut up- when loading, do not get body/hands in the line of the bore. NEVER attempt to fire a muzzleloader if the ball is not ALL the way seated on the powder charge.