Download the Universal app and just watch the wait times before you go on your trip so you know what to expect a week, or just days before you go into the park. That is what I did before I got my annual pass, I still look at the wait times from time to time, just to get an idea of what it's like, even when I do not have any plans. That way I have a general idea on how things are. Also, you get an idea of what is the most popular rides, regardless of how busy it might be.
But honestly, if you wanna idea of what to hit first? All of HP, new rides like Transformers, and popular kid rides like Flight of the Hippogriff, Minions, or Pteranodon Flyers (if you have kiddos). That way you get it before it gets crazy, or something I like to do, is ride things that require a locker to put all your belongings since a few rides (Hulk, RRR, and Dragon Challenge) you literally have to put everything on you (yes, everything in your pockets) in a locker, because even if the ride wait time is low, getting a locker can be a struggle. Also, single riders is a blessing, so if you're alone, or your party doesn't mind spitting up and meeting after the ride, do that. Less of a wait time.
