My advice is to keep coming back here. Of all the places to learn the rules, this is one of the best. Sometimes, the other posters on this site use the obscure "once-in-a-lifetime play" to illustrate how all the rules fit together.
This and other forums are great places for all involved in the sport.
Learning to deal with coaches is often difficult for a new official. Learn when they are just venting and when they have a legitimate question. Experience helps here.
Work as much football as you can. Nothing beats experience.
If you watch football on television, don't believe the announcers have it right.
Very few announcers actually know the rulebook well enough to make informed comments. Also, don't assume that what you see at the NCAA or NFL level applies to Nat Fed. level. There are 400+ differences between Nat Fed and NCAA rules. This is why rules study is so important.