Thank you! I'm glad it will help.
Yes, I recommend washing them thoroughly with mineral spirits after each use, otherwise they'll dry and turn into clubs. It would also help if you rinsed them with water after the mineral spirits, just to keep them extra clean.
Lol, that's totally okay! No worries.
Nope! I actually like using wood board (or Masonite) with gesso as a ground so that the oils won't seep into the wood. If you like more "texture", then canvas is a good option. Otherwise, if you prefer to work on smoother surfaces, I would recommend Masonite or some other type of hardboard. I personally love Ampersand Gessoboards, which I buy at DickBlick online. They're already prepared--you can paint on them right when you get them if you want. They're not too spendy either. Just be sure that whatever you use has a ground on it so that the paint won't absorb into the surface.
It depends I guess. Oil paint is much thicker, so you have to take that into consideration. If you mix too many colors at once, the paint can sort of look "muddy", but I suppose that could be said of any medium.