Actually, one of the best sites to go to, in addition to the AKC site, is the Westminster site itself.
http://westminsterkennelclub.org/
This is a demanding field and most handlers start young, that's not to say that you can't pick it up later in life. I would contact your local kennel clubs and ask for a list of local trainers, handlers, etc. and speak with them, too.
Barb