I'd say just read the tooltips. Healers don't really have rotations per se, you just play how your team allows you to. Your DPS will always be your DoTs followed by a nuke spam. You can weave in PoM to increase your DPS at that point too. As WHM have infinite mana now, using Cure II is almost better in all situations as it guarantees you a Lily. Also try keeping up a Regen on the tank at all times, and use Tetra whenever it's available. It should allow you more time to DPS as opposed to wasting GCDs on Cures.

Someone here is bound to tell you to ignore the Lily Gauge, but don't listen to them. A lot of WHMs are still being salty for no reason.