You don't need to pre-order. Just walk up to any ticket booth or guest relations (non-resort) and show your DVC card. You cannot get an AP at a resort. I usually buy it at whatever park I am going to first.
what are the costs of the annual passes for DVC members ? We are going down a couple of times next year and I'm thinking it may be a cheaper way to do the tickets.
If I bought a packet to disney world already with the free dinning plan, can I upgrade the tickets to annual pass, still get the discount for dvc members? thanks