Take a look here:
www.cactusumpires.com
This website was started for fastpitch umpires in the metro Phoenix area and has evolved into a site that many umpires around the country routinely check. Lots of local info for umpires as well as articles on philosophies and mechanics of umpiring fastpitch softball.
Your site does not have to be nearly as involved as Cactus Umpires, but it may give you some good ideas.