[ZzMayhemzZ]

well whatever units are used.. it comes down to micro-ing..
micro-ing(microing?) means to use a small group of units up to a large group of units,(You can micro a whole army if your really good...altho you will have some casualties)
to attack and dodge... basically.. using spells and range to your advantage. In this case, you will essentially be making tactical kills while dodging area of affect spells. Add a few zealots, Archons and reavers to the mix, or a carrier, and the job is a little tougher.

When the enemy (or enemies) FOLLOW you.. since they are locked on...
they are in attack move mode.. but you manually target to hit them before they hit you..

In your case, (in the early game, you probably wont have spells) so you split up your forces into 2 groups.. and attack from 2 sides.. force the computer templar or 2 to choose where to defend.. then run rampant with the other group.. Most computer toss have 2-5 spread out cannons so they wont kill very many men in the templar killing process

The temps have limited energy for storm.. and you can kill the temp while he is storming the other group..

If this is a UMS game... their might be more toss men or more cannons.. in that case.. might wanna wait til you have more lings and hydras to rush in before your hydras, or wait to learn spells.