Rough up the finish a little bit with steel wool or somthing and that's all you really need if you get self etching primer.
Get Dupli-color self etching primer, whatever color you want, and clear coat. Do 2 coats of self etching primer, about 4 coats of color and 2 coats of clear. You should have a really durable paint job if you do it right.
Btw you can get Dupli-color at Autozone or any other major auto store because it's car paint (it has a spray nozzle on it and it's aobut $6 a can).