First thing, don't get too anxious about it. You're just getting started and you'll pick up a lot of information just from reading this forum as one source. Don't forget about the EAA online videos, etc.. I use a note taking tool like Evernote or Onenote and every time I come across a useful bit of info, I create a note. Over time, you'll build your own personal knowledge base.
Know your mission. It might help to even write it down so you have a reference point for the kind of information you're looking for. You don't need to know everything about everything.
Sorry I didn't really answer your question.
Ask lots of questions. They're a friendly group here.

Just don't ask if you should prime.
Cheers!