CUSTOM FIGURE THREAD

Hey guys, I've decided to try and make a custom figure of my character from Knights of the Old Republic. I know some of us in the group have made some custom figs, so I was wondering if I could get some help. I have the base body, and still have to look for the proper head. What I need to know is what is the best kind of paint to use when I paint this sucker. What is the best to use on the plastic that the figure is made of?

Any help will be appreciated!!