In your initial post you posted a script, and you ask whether someone knows why it isn't working for you.

But you didn't say, what didn't work.
Did the level load?
Did you see zombies fighting against each other?

If you say, yes, at least that worked, then you only need to paste the following line within the curly brackets within the function main(), after the level_load instruction:


you = ent_create("zombiek.mdl",vector(0,0,0), character_walking);

EDIT:
Sorry, I posted too fast, forgot things that had to be changeed to make sense to you.