Hey, I was in the FIRST competition when I was in high school. At the time we were phasing out from using qbasic to a C microcontroller. So work on your programming skills.
Also draw up rough ideas of what your robot should do and how to accomplish it. I remembered that we controlled movements of arms using pneumatics.
Have your team members do specific tasks - example one for programming, two for building. Have those guys read up programming and pneumatics for example. Have one of the guys dedicate himself to controlling/operating the robot (controlling is not as easy as it sounds). He can give the programmer teaks and hints to improve the code; so he should also be familiar with the programming language that you guys will use.
If I recall correctly, our team had one programmer and a mentor, two structural builders, one operator and one team leader that's makes sure all aspects runs in sync. We had a couple more, but I don't recall what their exact roles were.
Good luck!