You'll probably want to learn the basic fundamentals of Radiant Black and how it works before you hop right into creating a zombies map. If you want to learn, just lookup some videos on youtube such as "Black Ops 3 Mod Tools tutorial" or things of that nature. Google is your friend.
Ive looked around a bit, and i have a basic idea of how to do things, but could i get a link or two to a tutorial about setting up buyable doors and working barricades. I know where the prefabs for them are, but i want to know how to make risers and make sure they spawn in and go the correct direction.