User blog:Zombiehunter115/How do I do this?

Ok, so I just bought and downloaded Call of Duty: World at War on Steam for one reason and one reason only; custom zombie maps. I have been on the NZP wiki for a while now, and I'd like to make my own creation(s) from the wiki into a reality. From what I understand about making maps, it's not easy. But that's why I'm asking you guys. Where do I start? How do I do it? I'd really appreciate as much help and support as I can get, as this is my first map. Thanks for any support. I'll be sure to give each of you guys credit for helping me.