You can transfer to a 4 year college and do AFROTC, or you can get your degree and go OTS, or you can do the whole ANG thing (which I don't know much about)

Basically, you should go for a technical degree (the Air Force likes them a lot more than non-technical degrees).  If you go enlisted, you might have trouble finishing your degree quickly.  It is possible, but your free time would be largely dependant on your enlisted job.

My advice, if you want to go Active Duty, would be to go to a 4 year college and join AFROTC.  They get a large share of the pilot slots in the AF.