Okay so let's start.
First off get yourself gems and enchants.
Helm: depending on mana you might want to switch your meta to revitalizing from burning.
Bracer: Preferably get the int enchant, but if you're cheap there is a mastery one.
Gloves: There are both haste and mastery to gloves. If you feel you need more spirit you can gem spirit in this socket
Waist: Belt buckle. See above comment on gems.
Theoretically you could pick up the 5376 haste breakpoint for an additional tick on Enveloping Mist, but that's purely preference based on how much tank healing you have to do in your raid group. The standard bpoint for you to gear for is 3145 haste rating.
MW healing is pretty simple to be honest.
Renewing Mist on CD. Get something to track how many you have out on your raid along with the time left on your lowest duration Renewing Mist.
I'm going to assume you understand the interaction between TFT. Prior to major burst you should TFT into Uplift ~8-10s before. I tend to try to keep good habits and do it right before my first ReM falls off 2-3 seconds after use ReM on cd, because well it allows you to have a better REM spread.
During AoE spike damage to the raid you should have TFT + full ReM spread on the raid, maximium chi before the AoE damage occurs for uplift spam.
Talents that affect our healing are the L30 talents, L45 talents, and level 90 talents.
L30 talent: Most MWs take Chi Burst for two reasons, one it can allow for massive burst healing on a stacked raid group, and two it can be used as a triage heal if the tank's health is dropping or a dps's health is dropping. The other option is Chi Wave which obviously pumps out solid healing, but it's not a doesn't output as strong of a heal in the short period of time that chi burst does, and doesn't have the raid healing potential chi burst has. Both are theoretically viable, but imho you should pretty much always take Chi Burst.
L45 talent: Power Strikes generates the most chi if I remember correctly, but it has a semi random nature. Ascension theoretically is a decent talent if you're fistweaving a ton and/or need a the extra mana generated by the increased health pool via mana tea. Most Mistweavers take Chi Brew because it allows us instant chi on demand for burst Aoe Healing, and is actually getting buffed come 5.4 or at least appears to be so on the current iteration of the PTR.
L90: This is pretty much up in the air Chi Torpedo > Xuen assuming you can utlize Chi Torpedo on the encounter well. Otherwise Xuen is probably the better choice, due to the eminence healing he can put out. I don't have the math on these talents, but you will essentially never see a mw taking RJW due to the strength of Chi Torpedo and Xuen.
Glyph RM and mana tea, cast mana tea when have 2 stack or more and mana < 80%.
During stacked situation, priority:
RM on CD > Expel harm on CD > uplift > CT x 3 > Chi Burst > SCK (gain chi).
^ the above is actually correct outside of it not accounting for Chi Brew when you run out of chi or need the on demand burst. Xingling is also correct about SCK mainly only being used to generate chi.
Revival has the potential to be an emergency heal, and should be used to deal with massive raid damage.
Myself, Mist, and Suplift are always around, and are always up for a good discussion on MW and/or helping others not be bad. I can't tell you the number of stories I hear about bad MW trials for top end guilds that I have friends in. You can typically find us either in game, in the IRC, or the OT thread.