Okay, I know this column is a little behind the Mists of Pandaria power curve. That said, if you happened to fall in love with another class (coughMonkcough) for leveling this time around, and you've just now leveling to 90...here's some tips. And yes, that's a moonkin on a mechanostrider by a fish. Why? Isn't it obvious?
Before your arrival in Pandaria
Well, that depends on what level your gear is at. If you didn't play significantly at endgame in Cataclysm, you'll find that the enemies get a lot stronger as soon as you hit ground in Jade Forest. You'll get pieces of 378 green gear as you proceed through the early quests, but if you're still rocking Mount Hyjal greens like some of my alts, you may want to look at picking up some Misthide crafted leather items from the auction house. If none are available, you can also ride to Dawn's Blossom and visit the gear vendor there for some starter pieces. You can skip this if you choose, but in that case expect the initial quests to be fairly difficult, and you won't have the item level to queue for dungeons right away.