The easiest load for a BP revolver is the Pyrodex pellets for 45 cal pistols (45/30gr). No measuring, just drop one in each chamber. Then seat your balls on top of them, and grease the chamber, and cap.
Grease wise I found that Thompson Ceneter Bore Butter is the best stuff on earth. It prevents fouling build up so your gun wont bind up after a few shots. It also makes cleaning the gun a breeze, and can be used a a lube or all your gun parts. Usually after I've cleaned and reassembled my revolver, I wipe it down with the stuff, and I haven't had rust issues since.
Percussion caps can be finicky things. I have found the RWS and CCI caps to give the best performance. Remington caps are.... just plain aweful. I would go with #11 caps. Just give them a little pinch to make them fit tight. The #10's tend to be very snug, and if not fully seated on the nipple may need a second hit to go off, since the first hit just seated them. The other benefit to the #11 caps is that they tend to fall off after firing, where as the #10's sometimes stick and need to be pryed off.
Round balls tend to all work well, but if it has a sprue, it can vere off target. I like using round balls made by Hornady, and Speer, since they are spruless.
For cleaning, soap and hot water is the trick. Just dissassemble the gun and wash the parts in a bowl with dish soap and water as hot as you can stand it.
Notice I didn't say to wash it in the sink. The sink drain is a fast way to loose your small parts. After the parts are clean, rince them in HOT water then dry them off, best you can, and set them aside to finish drying. Wipe each dry part down with the bore butter, to lube and protect it from rust, and reassemble.
Dont use WD40 on your gun!!! This stuff is evil
It will bead up and let rings of rust appear on your gun.