If you're just starting in black powder revolvers, buy or make a stand. Without a stand, you need about four hands. While you'll be able to do it with two, you'll have a much easier time with a stand. Second, it's safer with a stand because you don't have to worry about pointing the gun all over while trying to load.
If you're thinking of a cartridge conversion, you may want to give additional consideration to a forged frame Uberti. Personally, I'm not excited about the cartridge conversion cylinders; I've got dedicated guns that shoot cartridge only. Ultimately, that decision will have to rest with you.
Second cylinder? That would be nice, but if you get that, then a separate cylinder loading press would be pretty slick.