Gear - There are a few really great sets out there for healers to use. However, both healers should be using Spell Power Cure, this increases the damage for your group and with both healers running this set. It will maximize the up-time.
Also when groups split in certain trials, one group will not be at a loss, dps wise. Each Healer should pair Spell Power with one of the following sets. However both healers should NOT be running the same alternate set

Worm Cult
Mending
Twilight Remedy
Master Architect
Sanctuary
Kagrenac's Hope

Traits - I like infused on big pieces (Head, Chest, Legs) and divines on small (Hands, Belt, Shoulders, Feet)

Enchants - If you can afford them Prismatic enchants on infused pieces and max magicka on small. The extra stam from prismatic really comes in handy. I also run 2 cost reduction glyphs and 1 magicka regen glyph on jewlery.

Staffs - Technically you want the Master Resto staff or Maelstrom Resto Infused or Powered. However if you pickup resto staffs in the sets your farming for feel free to use them and pickup a Monster set if you can mix it into your setup. The same thing applys to your destro staff, ideally you want Master/Maelstrom Lightning staff with charged trait to set enemies off balance and skyrocket dps for your group.

Food - Play around with what works for you, I use Witchmothers brew, but Orzorga's Red Frothgar isnt a bad choice. Find what works for you and adjust your attribute points accordingly. You need about 18k heal in trials.

Message me in game or on discord for Champ Point help. Different play styles require different allocations, so its hard to do a generic layout.