Powering a Larger Motor?

[arpus maximus]

All right, before I write my question, let me just get one thing out of the way: I have absolutely no experience with robots, but decided to undertake building a (somewhat simple) robot for my senior project this year. I am not affiliated with the FIRST team at my school, but I am gradually learning a few things from them. One thing they could not answer, however, was a question about powering a motor, and they told me to post the question here.

Okay, so, anyways... The robot controller that I am in possession of only outputs 5V to work motors, LEDs, etc. However, I need to use a larger motor that requires about 12V. What is the best/easiest/most efficient way to make this motor work? I will be using a joystick to control the motor.

This may be a really vague, difficult question (or conversely, hopefully a really EASY question), but any help is greatly appreciated. Feel free to email me (arpus_maximus@hotmail.com) or just post here.

Thanks in advance,
ARP