Recently I made my first Photoshop tutorial. It is about a simple way of turning sketches into paintings.
Take a look how simple pencil drawing became a magical spider tree :) Have fun)
Oh, I'm puzzled with your question... I don't understand what you really mean, but I'll try to guess... I suppose you should take a proper program (like Gimp, it's free) and try to create some pics there. Or just draw on paper and scan drawings then. Pencil drawings do sell too.