How to use a custom map on dayZ?

 I am setting up a DayZ server for me and some friends to mess around on and we want to use a custom map.  I downloaded the maps mission files and the mod, installed the mod and key like normal.  I then changed the map choice to custom and typed the mission folder name in the custom map block.  Where I am hung up is on Nitrado I would add the mission file to the missions file.  So that is where I put it and now I cant get past the loading screen. 

What have I done wrong? This is why I left nitrado after 1.27 update, custom maps would not load for me and could not get any help.

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