The first project that you'll be working on is a simple RC car, like the one shown here:
This particular car is an Xmods car, sold by Radio Shack, also available at other retail and online outlets. You can certainly use other RC cars as well. The advantage of this particular set is that the inputs to the drivetrain and steering are very easy to access.
The following is the car, exposing the center control mechanism:
There are two connections that you will want direct access to. The first is the ...