You cannot get magic bands until you activate the AP's so they cannot order them prior to activating. When you renew you can get them right away because you already have an activated pass. A new AP has to wait to activate and then they appear in MDE to customize and order them. So they have to go and activate and will get the hard ticket AP's they will have to use the first time and can buy a magic band of they don't want to wait on a free magic band after they activate them and first use. When mine lapsed and had to get an all new AP later I had to wait until after we activated/first use and then they appeared in my MDE so I could customize and have them shipped. They said this is the process for new non activated AP's when I called.
For parking your certificate should work the first day you go to park but if you don't want to worry about that you can go to guest relations at Disney Springs and activate your AP's there then go to the park so your all set. We have done that before.