Don't waste your time learning to use different paints. Go right to urethane BC/CC. That is the standard of the industry now. You will be able to buy in anywhere, and the others will eventually disappear. You might as well learn how it works now, instead of later.

The only thing you will have to do for the flat finish is to buy a flattened clear, or mix your own using a product like PPG DX685, which can be mixed in anybody's clear.