Hi Marc,
While Where's Wolcott now uses official
FIRST electronics, back in 2009 and 2010 we actually didn't. Back then we used the FMS Lite set-up that can still be used for scrimmages and practices.
Basically all you need is a wireless router, a computer, two bridges, and a bunch of ethernet cables to connect it all together. This allows you the basic starting, stoping, and timing functions for the field. This however doesn't cover scoring, and this is something you would need to do manually.
http://www3.usfirst.org/roboticsprog...control-system
Scroll down to the FMS Lite section on this page, and all the documentation and software is located there.
While it isn't perfect, hopefully it's a good place for you to start.
All the best!