You will need a transmitter, a receiver, a receiver battery, two servos and some wheels. Modify the servos for continuous rotation (if you dont know what to do post here, people will help). Once the servos are modified attach some wheels (I use my sons lego wheels)and plug the servos into the receiver. With the receiver powered by its battery, the sticks on the tranmitter will make the servos run backwards or forwards. Thats it. Glue the servos down to a base of some kind and you have a robot. Fight it, rebuild it, fight it again.