You may change your first bar ( a bar with full of heal skills). Leeching vines —> unstable wall of elements from destruction staff for some dps. On the second bar you can replace 1st skill with healing spring in order to get mana regeneration cause it is high usable for trial. Elemental weakness is recommended if in the team no one uses that skill. Use bursting vines to cast big heal, instant teleport cause i name it Spiderman- healer. This is a noob build but big heal for main healer in trial, dungeons, boss world (>80% heal in dungeons vet with hard mode guaranteed). First bar should be full of heal skills in green balance cause of passive heal (10%).
Race: breton is good for spell resistance and reduce cost of magicka for skills.
Khajit: hm.... not bad at all.
High elf: u should put more dps skill.
Imperial: good regen magicka and stamina.
Dark eff: for some trial with fire ( flame damage resistance)
Nord: ultimate regen..... not so bad tho.
Orc: good speed running ( if u cant use bursting vine), more Hp and more stamina
That’s all races usable. Argonian recommended cause healing bonus.
REMEMBER: Bursting vine is verrry good for escaping dangerous situation by teleport instantly to an another ally