It's best to do your first body in one color. That gets you used to the idea of how it works. The body will come with masks to cover the window openings so you don't paint them. Any hobby shop will have special scissors to trim the excess polycarbonate off the body. You can use other scissors laying around the house, but it's significantly harder to do.
Here's my most recent bodies I've done. I'm going for a common look between all my rides.
When you get more confident, you can make cool designs using masking tape. The bodies come with a clear film over them to protect against paint overspray on the outside of the body. you can take a sharpie marker and draw the design on the outside of the film, and then run the masking tape along the lines. The more colors you use, the more masking you have to do. Here's an Evo body I did a few years ago.
