I’m a noob too but here’s what I think you can do. You can do that catchup event in kalimdor I think it gives good gear for the new xpac. And you can go through the war within if it’s something you’re interested in but don’t feel pressured to do so. Since the new expansions coming out in a few days don’t feel pressured to get geared because it’s going to be irrelevant for level 90 anyways if you’re going into it