If like me you're financially challenged, then you want to spend as little as possible. When money is tight I go back to basics. I get the 3 primary colours (yellow blue red) in translucent paints, and an opaque black and an opaque white. You can mix pretty much anything with this. When mixing a colour write down what you did, eg 1 red - 3 yellow and spray a bit of that colour next to it. Pretty soon you'll have a colour chart. (Bear in mind the base colour you use will affect tranlucent colours The thing to remember is that translucent colours deepen with each layer added, and are affected by the colour of the layer underneath. You can use an intercoat clear to seal a colour. You can also make any translucent colour opaque by adding opaque white, or opaque black. This means you can cover up the layer beneath, and that the colour won't change with additional layers. A reducer (I use wicked colours and 0100 reducer) can make your colours more translucent. So a basic kit of translucent primary colours, an opaque white an opaque black and some reducer, can become a surprisingly extensive range of colours. An intercoat clear, a translucent black/translucent white could be added to that, butr it isn't essential. If only all those lovely effects paints didn't keep calling! Lol! Whilst I'm on the subject if you like a bit of glitter, then I recommend Hot Rod Sparkle White by Auto Air. It's a transparent pearl flake and can be used with any colour, so no need for lots of different glitters. Anyhoo, that's my colour advice for any cash strapped airbrushers like me. Hope it helps!