Need help building my first 5e campaign character (AoE + healing + skills)

[KorvinStarmast]

I have rolled for stats and ended up with 16, 15, 15, 14, 13, 10. (:

What I'd do with your die rolls for the wood elf war cleric:
16, 15, 15, 14, 13, 10.
+2 Dex
+1 Wis
S 13 D 15+2 C 16 I 10 W 15+1 Ch 14

Why does my party need an arcane full caster?

They don't. Between you and the Druid, you will be fine.
No polearms with finesse property.

Inspiring Leader meets your goals better, IMO, but, Medium Armor Master may also meet your goals. See below.

I love the fluff of Inspiring Leader. How long do the temporary hit points last?

Until used in combat or your next long rest. You can re apply them after any short rest or long rest. It is a very good feat.

At level 4: I'd suggest boosting Wisdom to 18. Do the feat at 8.
Or, if you are bound and determined to have a feat go with Inspiring Leader.
Or, since you are a cleric and going dex heavy, Medium Armor Master.
That feat is sneaky good. It allows you to add +3 of your dex bonus to armor class; makes Half Plate into AC 18 without a shield.
And, it prevents the stealth penalty of Half Plate armor.
I have used it on both Rangers and Dex Paladins in the past. It's good.

Spell Suggestions:
Cantrips: Sacred Flame, Guidance, Toll the Dead
Level 1 Spells to consider:
Guiding Bolt, Bless(you have from domain), Protection from Evil/Good, Sanctuary, Healing Word