Well I'm feeling lazy and really do hate tuts on anything but the basic crap, anyways this is all I really need to post up when it comes to color.

The most useful thing would be this:

Also you can just use the paint bucket tool or gradient tool and use blending effects on them to help with colors and lighting. That and also just brush in colors.

Really just play around with that and you can get some nice colors. Just look up some tuts about everything else. Like I said before anything I know would probably be in the tut area...or maybe just search google for some detailed tuts about it.