You'll need model paints, Tester brand.

You should also carry a few oil paints. Keep it simple. Daniel Smith is a good name.

Acrylic paints is what you'll sell the most of. Golden Brand is the best, with the highest pigmintation, and highest markup.

also, keep a few cans of Krylon spray paint on hand, with the "krystal klear" topcoat, of course.