Just hit 90 last night, im specced enhancement and i pretty much have no clue what to do first as far as what faction i should work on first, or even where to go to do it. I pretty much hit 90 went to the Vale and logged.
I looked on sites for what faction seems to offer the best rewards for us so I could grind them out first.
Im also herb/alch and cant find any factions offering new flasks/pots/elixir recipes. Is alch pretty much done once you hit 600?
You can get use out of just about any faction. It depends on how quickly you want to gear and if you'll be raiding. I personally went for the Golden Lotus ring first since I only saw one 489 ring in MV. I didn't want to spend VP on something I'd have the chance of dropping immediately. You won't be able to start Shado-Pan or August Celestials until Golden Lotus reaches revered anyway, so you might as well start with them. Just focus on getting your gear reforged and gemmed and getting yourself to hit/expertise caps. After that, mastery or haste are both great secondary stats for us. Mastery is more consistently better, but your best bet is to not really reforge out of haste for mastery's sake. Have a healthy amount of both and reforge out of crit when possible to meet your hit/expertise goals. Also remember that going a little over on hit isn't terrible as you still gain a small benefit in white swings, but any more than 7.5% expertise will be wasted.
In Pandaria factions arent as mandatory as they were on past expantions. I, for one, just focused on tillers and golden lotus first because they looked fun (the farm thing is really cool) and had some good rewards (golden lotus dailies also double as rep with wrathion) and I didnt want to spend my entire evenings doin ALL the dailies in the game. Tillers adds the benefit of helping you get the mats for the best food in the game.
For gear I think Ive only been able to get 1 peace of VP gear so far the rest is from heroics + LFR and some crafted items. The focus in MoP is to get raiding gear from raids and not just get points and then get gear. Think of VP rep gear as a reward for players who dont raid regularly but do lots of dailies and friendlier content. VP gear falls more in the line of ¨ran out of luck in x drop so I´ll use my VPs for this upgrade in the mean time¨ rather than ¨I`ll cap VPs tonight to get my BiS before raid¨.
So, in short, pick 1 to 3 reps you want to focus for whatever reason and do those. Plenty of time to max them all out and by the time you get revered with all of them and manage to get the VP to buy gear for 2 or 3 items... if you did just LFR and world bosses... you wont have a great need for that gear.
Its important to get Revered with Golden Lotus first in my opinion because you can't do Shado-Pan or August Celestials until you've done that. I worked on Golden Lotus and Cloud Serpent (for the mount), and then Klaxxi and Shadow Pan. Now I'm doing August Celestials.