You can check map submissions help in the map submissions section. You will need a dump of the map (done by WoM, and if unavailable a staff member may be able to do so) and screenshots of the map as a whole, the spawns and main areas of play. You will also need to let them know of the dimensions (X by X by X), whether building should be enabled and opblocking should be on (unbreakable blocks). Then, if deemed good enough, they will boot it up in the server, make edits, and hopefully it will be ready for primetime! Next time you have a question like this a better place to post it would be to PM a staff member, particulary Alkatraz since he manages the map submissions or KingSam since he is the head controller.
Good luck! Can't wait to see it :)
-superstein