Hi Gregory,
Wow! 14 days at the Walt Disney World Resort sounds incredible! You will be able to soak up SO MUCH magic and fun during your visit!
I'm happy to let you know that yes, your theme park tickets will be linked to your My Disney Experience account, and your
MagicBand simply accesses everything there: your
Disney Resort hotel reservation, your theme park tickets, your FastPass+ selections, etc. There is no data actually stored on the MagicBands themselves, and yes, you will be able to continue using your MagicBands even after you move off-site. They will no longer work to unlock your room door or make charges back to your account, but you'll still be able to use them to enter the theme parks, hop in a FastPass+ queue, and link your
Disney PhotoPass photos to your account.
As far as making your
FastPass+ selections, you'll be able to make selections for all of the days you'll be staying at your Disney Resort hotel, including your check-in
and check-out days 60 days before you arrive. For the days where you'll be staying elsewhere, you'll be able to make those selections 30 days in advance, one day at a time. For some of those harder to find FastPass+ attractions like Avatar Flight of Passage or Slinky Dog Dash, I'd suggest taking advantage of that 60-day booking window and looking towards the end of your Disney Resort hotel stay for the most availability.
Thanks so much for visiting us at the Disney Parks Moms Panel, Gregory, and please let us know if you have any other questions as you're planning your trip. I hope that you have a truly magical vacation!
Missy