Just show up, and they'll tell you everything you need to know. The class start date they give you doesn't mean much- you'll start whenever they fit you into the next available class, so you might be casual for a while. On casual duty, you show up to PT 3 times a week, and that's it.
Its an AETC base, so when someone takes a dump, everyone wears diapers. We've had a few alcohol incidents lately, so the next person who screws up is going to get hosed. Overall its fairly chill at the squadron, and most of the instructors are fairly laid back and there to help.
Basically, don't sweat it. Its not difficult here.