Hi, I would suggest spending most if not all of your attribute points into stamina, the way eso works is that your damage is calculated on how much stamina you have as a stamina user and how much magicka you have as a magicka uses. At the end of the day it is personal preference.

If you want to dps and heal i would suggest respecing to magicka rather as most heals and buffs require magicka. Stamina builds aren't that viable as healers, though you do get access to two nice heals Repentance a templar skill, morph of Restoring Aura and Vigor though you do need to PVP a bit to get access to vigor.

As a stamina user most of your skills will be weapon skills and most class skills don't really have stamina morphs. You can always look at Alcast's Stamplar build for some guidance: https://alcasthq.com/eso-stamina-templar-build-pve/