Instructions
Look at the differences between a pistol and stick radio. Stick radios usually come with pre-built package RC cars, but most people find a pistol radio easier to use.
Try out a few different radios before you commit to buy. The RC car transmitter should be comfortable and easy to grip without feeling any pressure on your hand.
Ask about a specialty radio for your RC car if you're left handed. There are left-handed transmitters available, but your local hobby shop may need to order one if they don't carry them in stock.
Make sure the antennae on the radio can be adjusted. A smaller antennae limits the range of your RC car.
Choose a radio that comes complete with everything you need, including two servos, a transmitter, receiver and servo horns. If you aren't sure, ask the owner of the shop for help.
Check to see that the radio works with the receiver on your RC car. If the two sides aren't compatible, it will take a significant amount of time and money to run your car.