My go to is Citadel, but the pots can be annoying to deal with. I also like Vallejo, Reaper, Army painter and they are all dropper. I’d suggest just going to amazon and search for starter kits by those brands and pick one you can afford and like the colors for. Army Painter has some nice big starter kits. Citadel has good ones as well but they aren’t as large so you’ll end up buying two or three different starter kits to get a similar amount of colors as the Army Painter one.
Citadel metallics kinda suck, not sure about the other brands metallics. My go to for metallics and colorshifts is Turbodork followed by Green Stuff World.
The type of paint is acrylics.