New WHM - Need Direction

[Estellios]

One tip I have for newer healers is that Medica is actually significantly more MP-efficient at healing up the group if you have to heal 3+ people, and the range is huge. Some storyline bosses like Stone Vigil's boss have a room-wide AOE and using Medica will help you conserve your MP and get the entire group up to a safer HP level in case it flies away right after and your party has to dodge the tricky-at-first AOEs.

Also Regen adds enmity each time it ticks, so despite how amazing it is DO NOT use it before the tank has built hate on all the enemies he has on him. This also means Medica II (which heals everybody AND applies its own Regen effect) is incredible amounts of Enmity and while it is a fantastic spell you will probably need to save it for the tail end of boss fight after you've used a Shroud of Saints or two.