Hello Harry,
Welcome to the TMA Forum.
One thing that rollingb did not mention was you should pay particular attention to your ramrod. It should have 2 brass ends on it, one is flared and the other is tapered. Look closely at them and see if they are pinned onto the ends of the rod. If they are, you're good to go. If not, you should drill holes completely through them (dimple each place you are going to drill) and insert either a piece of brass round stock or a metal roll pin. 3/32" works fine. It should be 3/8" long.
Also thoroughly wet the cleaning patch before you run it down the barrel, else it will hang up in the barrel and you will be writing another letter to us wondering how to get that out.
Items you will need to load the rifle are an adjustable powder measure 0-120 grains, a short starter of the appropriate size and an appropriate size pour lid for your powder container. Horns, flasks and other things can come later, the pour lid works fine.
For the ramrod, you will need a correct size cleaning jag and ball puller.
There are dozens of other goodies that you can get later, for now this will get you shooting. They can all be found on line at Track of the Wolf, Dixie Gun Works, October Country, The Gun Works, etc. All good places to do business with.
You should also get a spare nipple, I think the right size for you will be 6 x .75 mm
Best of success with the new rifle, hope you really like it and join our happy little group.
John