Hoping for some advice, please, I joined a Facebook group and have looked at some groups online but still feel a bit unsure, so I need explanations like I am an idiot please! 
I've booked up for 2 weeks at the end of June and have tickets for Disney, universal and sea world. We are staying on international drive and using public transport. It's teen DD and I.
We have been before years ago in a big group, stayed in a villa with a car, so bit different.
So from groups on line people seem to be booking fast passes/meals/characters all really far in advance. Last time we were there you put your ticket through a machine and were told when to come back. Is this not the way it's done now. So do you need to know in advance what days you want to do each park etc (seems a bit over planned to me) is thus done on the Disney app??
We aren't fussed with characters meals. Do we need to book other restaurants really far in advance?
We have a memory maker included in our package, I take that to mean one ticket stores all the photos that are taken in the Disney parks, is that the case?
Any other tips, things to do, places to eat, that we shouldn't miss out on?
All advice greatly appreciated! 