But OT.. I've just hit 41 on my Templar and went with magicka all the way. Jabs will be your main ability. Blazing spear is pretty decent and will stun ONE enemy as well. Basically you'll be able to yolo the entire process using jabs and breath of life (Rushed ceremony morph). I did find backlash pretty useful on tougher enemies such as bosses. It will build up all the damage on them over 6 seconds and then release it with a 33% increase. You'll want to keep a Dawn's Wrath ability in your skill bar anyway so you rank that skill tree up, then you'll be able to get jesus beam, which basically disintegrates low health targets. Also, I'd use a resto staff as early as possible. At rank 20 you'll be able to get Steadfast Ward for extra protection, then it eventually can be morphed into Healing Ward, which will heal you 100% of the armour left once the spells finishes. Find a resto staff with the training trait and it will rank up in no time. I also crafted a set with training trait so my light armour ranked up quickly too. Light armour obviously doesn't give you as much protection, but Annulment/Harness Magic and all the passives you receive towards your magicka are worth it imo. Perhaps wear some heavy armour as well in case you decide to go that route later on. As long as you're wearing a piece it will still level up.
Gap closers are always handy to have, so you can get in range for your jabs. Focused charge will do the trick - and it can be used as an interrupt while stunning the enemy.