Two things to remember:

1) NOTHING is ever stored "on the bands". EVER. Each band contains exactly one piece of data - a unique key code. That key code is linked to an individual in your MDE account. Each person can have multiple keys (bands/cards) attached to their account. The bands merely access the data stored centrally in your MDE account. So, your resort band will work just fine provided your AP shows in your MDE account. The band you can get with the AP is nothing special - just one more magic band. And you won't get that band when you activate your AP, either. Once activated, your MDE account will show that you have a new band that you can customize - just like you did with the resort bands. You customize them, click complete and they'll be sent to your house.

2) AP must be activated before they can be used. Activation requires a trip to any Guest Relations window OR any park ticket booth (including the water parks). All adults must show a government issued photo ID. Some APs also require the appropriate proof that the person is eligible for that type of AP (DVC gold pass, for instance requires the person to show their DVC membership card). Minors do not need to show ID, so typically, Guest Relations well go ahead and activate APs for any minor children on your account even if they are not present. Occasionally, you might get a CM that is a stickler for the rules and won't do it without the child present.

Hope that helps.

Steve