yeah, what nat said is what my teacher thaught me. And something else:
After you decide what and where you are going to draw, put a layer of paint just to be the base of your painting. You don't have to worry about painting inside the edges or having the colors that you want. That layer of paint removes the white spots and helps you have a better idea of how your painting is going to look like.
Then just go on as normal but from back to front, like nat said.
