AFAIK you can only get a discounted AP if you belong to the AAA South (I think that's Florida / Georgia / Alabama / maybe a few other southern states) or possibly pick it up in person at an office of AAA South.
For booking a room, you can just call Disney and ask for the AAA rate.
HOWEVER, all that said ... are you a
DVC member or did you post on the wrong board?
DVC members get $100 off the price of a new AP. And although most DVC members don't need to book for cash, we can get 25% discounts on cash rooms at DVC resorts a lot of the time through Member Services.