Can you give me some advice about airbrushes?

My dad bought me a Beaver B-200 airbrush and I have some questions about it. The brush only came with two cartridges, which seems pretty inconvenient for the type of art I want to create. Is that normal? And what kind of paint am I supposed to use in the cartridges? Are there some good websites or YouTube tutorials I should check out to learn how to use the airbrush?