This build is built around Lightning strike using moderate or high attack speed weapons such as Daggers, swords, and rapiers with these weapons you want to focus on physical damage and maybe grabbing some elemental damage with it, but physical damage is you're main priority. Here is a quick look at my skill tree.
(Build shown is at level 63)As you can see i hit a few High dexterity nodes frankly because templars don't get much dexterity at all. (because daggers, swords, and rapiers require quite a bit) Also that i grabbed quite a few elemental damage nodes if not all i could get, because Lightning strike converts 50% Physical damage to lightning damage which makes it scale fairly high. Not to also forget about you're offhand, you should be using a shield. Because a shield provides a good amount of resists (unless you prefer not to use a resist shield)and survivability while focusing on getting life nodes and some decent health regeneration. Also to explain the resolute technique, i take it because it provides reliable constant damage to monsters. (Here is my gear so i can explain more)
I will admit some of this gear is very good but it does not require a 5 linked item for this to work or an incredible weapon. But to support Lightning strike i took it with Weapon elemental damage, (because of the physical to lightning scaling) Chain, (for great Aoe) Faster attacks (for increased ability use and effectiveness)and mana leech is optional very much depending on you're mana situation. But you can use Life leech or faster projectiles for use with lightning strike aswell. For you're rings and amulet you want to go for as much elemental or physical damage as you can but without sacrificing too much of you're resists (but having a resist shield frees up alot more options for this)Same thing with you're gloves but you also want increased attack speed on them if possible.
For you're auras you want to choose one of the three elemental auras. For my self i have chosen anger and you are going to want plenty of mana regeneration so you want to definitely pick up clarity when you can.
For curses you either want conductivity or preferably elemental weakness.
Other optional armor links
4 link - Lighnting strike, weapon elemental damage, chain, faster attacks.
4 link single target - Lightning strike weapon elemental damage, melee physical damage, and point blank
3 link - Lightning strike, weapon elemental damage, chain.
2 link - Lightning strike, weapon elemental damage OR chain both work well at this stage.
Some strategy is to shoot you're LS from a distance when dealing with packs and for rare mobs or bosses you want to run up to them and just shotgun them until death (may require some monster kiting depending on the boss or rare monster) and to deal with lightning resist and immune curse monsters you can pick things like Ligntning strike with Weapon elemental damage, melee physical damage and point blank to combat this.
Small note: i took leap slam in order to get out of tricky spots.
Certain projectiles from ranged monsters
May have a moderate health pool depending on gear
Also LMP (lesser multiple projectiles) is a reasonable substitution for chain until you receive/trade for one.
Please leave questions or constructive feedback for me in order to work out any kinks in the build! Thanks :D