Controlling with a potentiometer. RC

Cheers i didnt realise how annoying it can be im new

That's a big part of the problem. Not that you're new, but that you didn't bother to read the forum before you post. If you, you would have found many threads about RC cars, motor speed control and other interesting subject which may or may not relate directly to your problem. Instead you barge in here screaming "I want, I want, I want" and "gimme, gimme, gimme" without even bothering us, what you want and what you have to start from.

Korman