Use Region Events via GUI.
if you dont know how to use it, I advice you to learn about it at an early stage.
Unit - A unit enters Zombie Spawn Point <gen>
(Unit-type of (Entering unit)) Equal to Zombie
Unit - Order (Entering Unit) to Attack-Move To (Zombie Move Point)
Then continue with If/Then/Else statements
if you want the zombies to simply to automatically locate where the hero is. the zombies must have a high acquistion range
and you can simply change Zombie Move Point to All Units Owned By Player X matching condition (THE HERO)
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