You need pubs and map files. For server testing purposes only you can go into the Endless-Online client folder and use the maps and pub, but DO NOT host an online server with these files, as they are copy righted.
The maps go into the Seose/Maps folder,
The pubs go into the Seose/Data folder, (All four of the .e*f's)
To create your own files after testing is completed, to run your server legally you can find a map editor/creator on this site in the downloads or use Rena's. Http://files.scottdollins.com/Rena/
To create your own pub files use EditPub v3.0, which is located on the same site listed above.