w00t!!
Dude you're the unit creator number 1000 to ask this question. You win a prize!!! ;D
First things first. Place a gamelogic in the editor and to make things clear, name it as Server
Now, if you have stuff that needs to be executed on both server and clients in the script which you're using to create the units, you can put
?local Server:in front of every createunit line you have.
If nothing in the script needs to be run on clients you can just save their computers and put
?!local Server: exitin the beginning of the script.
For more material, use the forums 'search'-function on the MP board. There should be some tutorials in the editors depot too.
* Artak mumbles something about the createunit becoming the old inflame