Just like any hobby, the satisfaction you get out of it is derived from the effort you put in to it. The PDF is exhaustive, but you don't need to memorize it all-but it is important to be able to visually ID targets from memory. There is no time to consult the nice PDF you linked mid-flight. I would suggest reading the brief and determining the enemy order of battle, and from that looking at the PDF before getting into the cockpit. Even knowing the differences between the friend and foe, gaining and maintaining situational awareness is most important. Knowing where you are, and in relation to the disposition of ground forces, is paramount. Once you get the point where you can discern the difference between a BRD and a Strela-1, you'll appreciate this hobby even more! It is a real challenge in the simulation because it is a real challenge for the real pilots. So, hit the books!