check out the work of these responders, and decide if you prefer one method or the other since there are so many ways to do this. Overall, just practice.
Buy a 2gang solid white electrical switch cover plate from Lowes/HomeDepot/ACE.... Then you can practice all you want, wipe it off, try other techniques... The white plate will let you see the effects of having the basecoat down for various colors. Buy a black one as well if you like a lot of dark baits.