I know the basics.. I think? Just feel free to give me some good advice.

stat all int, run your EE heal from acc slot, HM charm in the main, get all the highest HM equip possible

put some points into vitality to start since you dont want to see yourself die. then allocate the rest of the points into intelligence.

As for items, get all heal mastery items (weapon, armor, charm) and get a heal charm with enhanced effect and put that in your acc slot.

Then in a catacomb, simply heal the people in your group and if you're not healing, switch off to your melee (weapon) and attack with that to get xp.

everything you wear should have heal mastery except your heal charm, heal charm should have enhanced effect

weapon - heal mastery (any wearable kind)
armor - heal mastery (any wearable kind)
main slot - heal mastery (any wearable kind)
acc slot - enhacned effect (heal type)

It helps. Thanks guys.