It's all depends if you want magicka or stamina. Magicka templars are nasty when it comes to dps. Not as good as a magicka sorc with high overload burst dps, but still can consistently crank out the dps. For stamina, I recommend a red guard DK. You get% of max stam back when performing a heavy attack (once per 5 seconds). You want to put all points into stamina, you'll get to 18k health with glyphs on your gear. For champion points on the blue tree, equal points in thaumaturge, mighty, and precise strikes as all three of these will greatly improve dps. So this build is a DoT build. Dual wield daggers on the first bar with venomous claw, rearming trap , flames of oblivion, steel tornado, and flurry. You want the duel daggers to be maelstrom to have 100% chance to proc the increased dot damage after using flurry. Back bar is a bow with arrow spray, igneous weapons, poison injection, vigor , and snipe. You want this weapon maelstrom as well. As far as gear sets, I go 5 piece hundings , Molag kena helm or shoulders and veildraiths helm or shoulders . Both of these monster pieces increase weapon damage. Get your jewelry with 3 piece agility set. With this set on and igneous weapons applied, your weapon damage will be around 4.2k with 60% crit.

Practice. I was bad at tanking until I made an effort to be aware of enemy mobs and studied fights.

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People still play ESO man that game needs to be locked away in a closet and Tuesday devs punched in the balls and curbed stomped

If you are just levelling your character you don't need to be a set role like dos, just use whatever you like because it's not really hard. But if your at end game level look up a build via google, it's much easier than having someone explain it all to you over messages and posts