I mentioned earlier about going out to
http://www.referee.com to obtain the name of your local association. I highly recommend you hit that site and download the document titled "Officiating Youth Sports Football 2004." It's a great document to view.
For all you veterans...there's a signaling quiz on page 8 that you may find useful. It's not simply the signaling, but the proper sequence of signals in 9 game situations.