Any advice for a WHM?

[Empty-handed]

ehhh, what?

you should be fine putting regen on tank when running dungeons. like. dont obviously put it on tank before he pulls. use it after the initial pull and right after tank aoe agro mobs. Divine Seal it if you want to holy :/

the regen tick will wear off by the time the mobs are dead. (reapply stoneskin for next pull) :/

[Selli]

Cleric Stance
If you are unfamiliar with a fight, it is best not to be in CS. If you're frantically pushing CS to get out of it during its CD, you might accidentally recast it again. And when you do get out of CS, you might panic heal, which might cause you to overheal. Overhealing isn't the worst thing you can do, 'cause, I mean, the tank isn't dead, but it's not very ideal either.

It is 100% acceptable if you don't DPS. No one is going to yell at you (and if they do, you can just... not heal them). You're a healer and your main priority is to heal.

Mana Management
Your MP should never be below 50% before you pop SoS for the first time, because you will probably run out of MP and still have a long CD to wait on. I like to SoS around 75% MP and then recast it as soon as its off CD.

(UGH. Silly post limit. I'll need to continue in another post)

[Selli]

Medica I and II
Both are situational, here are some situations where you will have to pick between them.

1) Is there raid-wide AoE that is going to repeat? (ie: Titan Stomps) I use M2 for this. The HoT helps tick up for the next hit(s) and continue to regenerate HP after the AoEs have passed. When the AoEs are over (as long as no one is below 50%) there is no need to cast M1, the HoT will get everyone up and most bosses have a period of rest before they do any more AoEs.

2) Are there adds coming out? (ie: Garuda sisters) If you have M2 ticking on everyone and adds pop, you are going to have aggro and it might be hard for a tank to get them off you. If you know adds are incoming, but the raid needs a heal, just use M1.

3) Are your DPS getting hit by everything? (ie: every fight ever) If so, then you'll probably want to M2 because they're gonna drain your MP so fast if you have to M1 constantly and/or single target heal on top of that.