how to install gamemode(zombies or RPG)

[str1806]

Hello, here I have a question for example, when I put fashion TC / CTF everything is fine, but when the zombies turn on modes or RPG, I wrote that misuse the name of fashion that's so like a zombie mod set as I understand we have to take a script, and thrown into the scripts folder, and call zombies.py, and then specify the name of the zombies in the game when so doing mode.but still writes that the wrong name fashion, how to fix it? or if it can be a complete tutorial on how to install additional gaming mods.