Take the talent that he has in-game at Lvl 1, the quest, which this site doesn't have for reasons.

At lvl 10 take Suppression Pulse against AA champs, and Purifier Beam against immobile champs.

At lvl 13; take Triple Strike if you're against tanks. Graviton Vortex if immobile easy to kill champs. Phase Bulwark if mages.

At Lvl 16; take Titan Killer if against tanks. Blades of Templar if you wanna be an ******* to the enemy who pre-16 had a chance of escaping. Take Force of Will if you wanna stay in the fight but they have damage.

At Lvl 20 upgrade whatever lvl 10 ultimate you took, or Zealot Charge if you wanna pair it well with the Lvl 16 talent

At lvl 10 take Suppression Pulse against AA champs, and Purifier Beam against immobile champs.

At Lvl 13; take Templar's Zeal against a team with minimal magic damage, against a team with heavy magic damage take Phase Bulwark.

At lvl 20 take Orbital Bombardement if you took Suppression Pulse, if you took Purifier Beam upgrade that for if they have immobile champs. If they have mobile champs take Zealot Charge. If they have bruisers, take Plasma Burn.