does anybody have a tutorial for how to make custom maps? or a very detailed written tutorial? thanks!

Hello guys, My name is ETHG and I am a 15 year old youtuber from the United Kingdom.

I am a huge zombie fan and love custom zombies!

I am looking for a map maker who would like to come together with me and design a map! I can make the trailer and GFX for the map if need be and ...