Well, don't wait until then to get started.
There is an "officiating" page at the NCAA web site. try this:
Football Rules
Start looking there and d/l the current rules book, maybe order the video.
Go to this forum site for NCAA only stuff:
NCAA Discussion
Get a copy of the Redding guide for NCAA football.
Get a copy of the current NFHS/NCAA football rules differences manual.
Find out what mechanics this chapter normally works under and go get a copy of the CCA manual for eitehr 5,6 or 7 man mechanics.
Start reading this stuff in like March.
Sorry, I know nothing of NAIA.. Can't help you there