ever built or played with a small r/c car and got nowhere but a very flat surface? those little cars can't go much of anywhere and can't carry much of anything either, what you need now is a heavy duty vehicle. Now your in the Pro league. This Instructible will teach you the basics of what you might electronically need to build such a vehicle.
Step 1: electronics
This will include the all the necessary components to control the bot.... you will need motors around 12v, the motor-controllers that change their speed, signal boosters (for use in my set up),Tx & Rx ( transmitter and receiver),tank signal mixer, main power source, battery for Rx, and chargers for all power sources.(also a fuse or breaker is needed for safety)