Need A Triggerer

I need a guy that can help with triggers with my map my map is about zombies and is like dotd, rzo, swat together. The things I need help with are....
-Save/Load Trigger
-Zombie Waves/Movement
-Items Switch units into other units (on this trigger i can do it probally i just need to see one)

So if theres anyone that can help me will you pls post

And again, please SEARCH before you POST.

There are enough tutorials, spells, systems & stuffs arround that can help you!