For brand new healers, there isn't much to say. Most gear at low levels have similar amounts of mnd/int so it usually isn't a big deal if Cleric stance is on all the time.

Their starting skill sets are pretty straightforward​ too. Ex. CNJ gets cure 1 for heals and that is about it.

Just make sure they aren't​ pulling aggro by healing too early or generating excess threat+wasting mp via overhealing. Make sure they are keeping you in range + in LoS. Always a plus if they contribute to DPS.

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Later on, the loss of MND in cleric stance causes a hefty healing penalty. Healers should activate heals out of cleric stance and activate DPS abilities​ in cleric stance.

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Toward vet status, you're working on optimizing dps, making compromises between MP efficiency and time efficiency, anticipating damage, working dat CC, etc.