exterior should be sanded with something like 400 wet paper at least.. or barring that.. scotchbrite pads. is a good idea to remove all rust and primer, however primer isnt totally necessary.. i would NOT use rustoleum, but acrylic enamel which u can get from an automotive paint store. in fact, find one of those businesses, and ask the person at the counter what preperation and primers, reducers and the inexpensive enamels and they will help u with everything.
i have painted many cars for resale by just running over the exterior with scotcbrite pad and just shooting some industrial enamel.
the inside, i might use rustoleum..
also you can go online like places such as eastwood.com, or paintforcars, and read how to do the painting..u should get air compressor, paint gun, etc.... harbor frieght also has website...
Jesus Christ... Conversion in progress.