Welcome to the fun of build season!
First place to look is at FIRST
http://www.usfirst.org/community/frc...nt.aspx?id=452
Section 8 - The Robot is mostly what you need, be sure to download and read all of this stuff! The rules are most important, but the Power Distribution Diagram and Tips, Guidelines and Good Practices document explains how to wire up the robot and important info about motor selection, etc.