First clean the rifle thoroughly to remove all factory preservatives. Finish with a light coating of good gun oil such as Breakfree CLP or RemOil or ??
The breech plug, make sure it is thoroughly clean and dry and that you can see a nice circle of daylight through it. Wrap the threads with a single layer of pink teflon tape. There are many posts on this forum about how to do that and I even go so far as to recommend the Oatey tape for consistency. I generally put just a touch of good grease over the tape on the forward threads (Slick50 ONE grease, Amsoil food grade grease both work well and one tube or tub will last the rest of your life). Some omit the grease when using the tape. Some use only the grease. It somewhat depends upon the fit of your particular plug in your particular rifle.
The breech plug should probably be stored uninstalled until you are preparing to actually shoot, range or hunting. Before loading, patch out any oils from the bore using alcohol dampened patches followed by several dry patches. A shot of clean, dry air through the breech plug is a good final prep before installing.
Powders - I recommend loose powder along with some of Lane's tubes (or other properly sized tubes) to carry premeasured powder charges. I happen to prefer a size that Lane doesn't sell - the 7ml as it holds ~110 grains by volume quite nicely. You can also put a couple of your chosen projectiles in one of those tubes and carry enough loads in a jeans pocket for a hunt. 3 or 4 extra loads for hunting should always be plenty - if not, try another day.
Pellets are convenient but also quite expensive by comparison to most loose powders.
Powder choices - Pyrodex P or RS or Select - cheaper, capable of excellent accuracy - extremely corrosive and one should not delay cleaning EVER after any shots fired on a given day. Bore residue is moderate and often allows a few shots without between shot swabbing. Hygroscopic and one must be very sensitive to moisture and storage method.
True black powders - same properties as Pyrodex but not quite as corrosive. Easily ignited by even weak caps, surefire ignition. Bore residue with some is considerable and between shot swabbing is generally advised. Will recover from moisture contamination if allowed to dry.
TripleSe7en - a bit more expensive, very accurate when fresh, hygroscopic and leaves a hard crud ring after each shot in most barrels. Keep away from moisture. Harder to ignite than true black or Pyrodex but not as hard to ignite as Blackhorn 209. You can use slightly reduced power muzzleloader 209s which many claim reduces the crud ring effect.
Definitely swab between shots.
BlackMag3 or XP, pretty clean burning, not terribly corrosive, but also VERY hygroscopic. When fresh and dry, shoots accurate and leaves only a mild residue in the bore which does not require between shot swabbing (but accuracy might still be enhanced by swabbing).
Blackhorn209 - the newest, cleanest, hottest substitute going. Expensive but dern near worth it :wink: . Meters very well in volume measures, provides great accuracy. Negatives, hardest to ignite - requires a full strength 209 primer such as the Federal 209A or CCI209M. The Win209A, Remington STS, and Cheddite primers will also work. Leaves a hard deposit of carbon residue inside breech plugs after several shots. Clean with Hoppes #9 or similar solvent. Easy cleanup except the breech plug channel generallly requires use of solvent and a drill bit to break up that residue.
I'll leave the APP, Jim Shockey and similar powders out as I have no real experience with them.
Projectile - anything from 80-100 grains of any of the above powders beneath a 200-300 grain quality bullet (lots of posts on bullet selection here) will get the job done. I generally prefer Harvester crushed rib sabots (black) combined with a Speer or Hornady of .451/.452 in 300 grain weight. Lately I've specifically used that sabot with a .451 Speer Uni-Cor soft point over 95 grains by volume of BH209 with excellent results.
Capper - a Tedd Cash style straight line 209 capper will hold quite a number of primers and will work with every rifle I've encountered.
Range rod - you'll want one. Saves wear and tear on the included rod, good ones are much more durable and easier to use at the range. Knight made a good one that has a T-handle. Great for cleaning as well as loading.
Volumetric powder measure - the TC U-view excels.
Lots of cleaning patches, swabbing solution (ask a more specific question about what is best for this after you decide on powder), cleaning solutions (same as swabbing question), pipe cleaners, old toothbrushes, a m/l cleaning brush set to include a brush for cleaning the plug threads (a bottle brush can be used for this), supplies for dealing with the breech plug lubrication, rags for cleaning or wiping down, and probably a lot of other small items you'll find to be handy.
Scope - the most flexible scope mount for your rifle is probably the one sold by EABCO for CVA rifles. Offers lots of slots for Weaver type bases.
For rings I prefer Warne 1" QD rings or TC braded Warnes. Medium height should easily accommodate most scopes. QDs enable easier cleaning of the rifle while at the same time keep the scope away from some of the harsher cleaning agents used.
The scope itself could be any quality scope but it should offer decent eye relief, range of powers that you prefer or a good fixed lower powered scope. Stick to good brands such as Nikon, Leupold, Burris and pay attention to range of adjustment in the scope's specs. Sometimes scopes tend to run out of adjustment before the rifle is zeroed (Leupold is probably more guilty of this than some of the others). You will find some here advocating scopes by lesser known makers - don't overlook them but look for multiple positive comments by different users.
Hope that helps. Consistency in all things is the key to accuracy with a muzzleloader. Have a blast and be safe!