Hello my ingame name is Zackeryss, ill help you build you map!
I reccomend you using SethBlings mcedit! it allows you to make custom mobs and much more. I think you should also get Too much items mod because it lets you save any custom items in Favorites section!
Okay, thanks for choosing to help! I'm gonna be on in half an hour and i have not enough items and mcedit, but i havent used it for the map. Thanks again for the help. And to anyone else, I'll be on in half an hour and we can work!