In order to setup you FP+ in advance, you have to preorder you tickets (we used Under Cover tourist) and enter the code on the back of the cards. I'm not sure exactly how it works if you preorder direct from Disney and plan to pick them up when you get there but I would imagine they will let you have access to FP+. The system will not let you book your FP+ without the tickets attached to your account. If you at not staying on site, the system will only let you select days within the 30 day window. ADR's for offsite are still 180 days and you DO NOT need tickets linked to make the ADR.