The only trick you can really do with an rc car is a backflip. to do one you pretty much just gun the throttle in the air. i don't know about flips with 2wd vs 4wd. also, you need the right ramp to do it, it has to be pretty steep.
Keep in mind that no car is really made to flip, even though they can. They aren't really trick vehicles, just racing and some jumping. most tricks just come from pulling off different jumps. try jumping over things if you wawnt