Yes, if the tickets are in your My Disney Experience account and assigned to people who are staying at the resort with you then you’ll be able to make your FP reservations 60 days before your check-in date.
I’d call at some point in the days just prior to your trip just to make sure they’re activated already. If not then you can do that at the TTC, guest relations OUTSIDE Magic Kingdom, or at Disney Springs guest relations. You may be able to do it at SoG, but we’ve never actually stayed there since we’re DVC members.
And yes, you can use your Magic Bands. Any tickets you have assigned to a person in MDE will automatically be linked to that person’s Magic Band.