Second, I strongly suggest you read the following two articles from USCF. Although they are geared for chess coaches and scholastic chess organizers, they are very helpful for you to understand how scholastic chess is running. Both are well-written, but both take some time to read.
Here is an interesting guide for complete beginners' parents.
A few more guides are here.
There are a few books written a decade ago, which enjoy excellent reviews. Unfortunately I have not read either one so I can't comment. But they are definitely classics. Remember one thing when you read, using computer and playing online were not popular yet a decade ago.
A Parent's Guide to Chess Paperback – April 2, 2002
by Dan Heisman (Author)
Winning Chess Tournaments for Juniors Paperback – September 14, 2004
by Robert M. Snyder (Author)