[Twisted_Insane]

You want us simply to script you - like it ain't a thing - a whole gamemode? That's a little rude seen mentally, but well, I would suggest you to look for a one:

http://forum.sa-mp.com/forumdisplay.php?f=71

There are millions of zombie-gamemodes, and if you don't like to look for it all time, use the search function and search for the keyword "zombie" in the forum section "Gamemode Scripts"!