Next, cleaning with a bucket of water? What's the procedure here? What other supplies do I need? Answered above.
Lubing patches with dish soap and water solution? Works great. Will the water affect the powder charge? No.
Can't measure lands and grooves yet because the gunsmith still has it, but I picked up some Remington #11 caps, .495 balls, and a pound of Pyrodex RS just because I couldn't find any real BP locally. If they don’t sell it at the club you can order it from Grafs or Powder Valley when they have free hazmat shipping specials.
So, the Fg indicates grain size, and the more F's the smaller grains? Measuring by volume, I have a Neilson benchrest powder measure, will that work? Get a black powder measure, adjustable or they come in fixed sizes, they are cheap. A powder flask/horn is usually required at most clubs.