For the electronics components of the robot, there are certain rules you have to follow in the interest of safety.
Certain gauge wires to certain things, fuses, spikes, relays to certain things.. etc..
Use the following as a guide, and just build a test board with everything mounted to a piece of plywood or something for now, being sure not to cut any cables or trim any cables yet.
Your final electrical setup may vary from what is shown obviously with whatever components you decide to use or not use, but this will give you a good idea of how each component should be laid out and how they need to be hooked up.
http://www2.usfirst.org/2008comp/Man...on_Diagram.pdf
Good luck!