You will not get the AP magic band mailed to you or the option to customize until AFTER you activate it so you will not get it for that trip. You will though get bands from your resort stay that you can customize by 30 days before and mailed or you ahead of time. They will give you a hard AP card you can use for all things related to the AP. But you can use your resort magic bands for park entry, FP's, room entry, charging to room etc. Hard card Is only needed for your discounts etc.
Also don't wait to buy your AP being you need it it make FP's and can do so 60 Days out being you have a resort stay. I would buy it at least by your 60 day mark.
But yep the AP band they do not give them out at WDW you have to order them after you activate your pass/first use.