Arizona's a good place for biking! I lived there myself for a few years.
The big issues you're likely to run across with the bike sitting for so long is the fuel turning into varnish and clogging everything up, and the rubber seals, gaskets, hoses, etc. hardening and cracking from the hot, dry weather. I'd start with the fuel system and go from there, since there are products specifically for removing gasoline varnish from fuel systems and it's not very difficult. All the rubber is going to be more time-consuming to look over.
ATGATT || Proud second-hand owner of a well-loved Honda 919