Hi there!
The exact parts you will need for your electronics board depends a bit on your robot and especially what number and types of motors you are planning on using.
The documentation listed by the previous posters, in addition to the
Competition Manual, should give you a good start.
I'm a student at the University of Minnesota, so if you or your teammates read through the material and are still completely lost I may be able to make it over and help you out if your team works at your school. I've sent you a PM with my contact info and some times I would be available.