For the Mac OS X binary, you must download the server, then download the latest maps. Untar the maps in the etc/crossfire/ directory inside the server directory. Once this is done, you should run the crossfire file in the bin/ directory. If you want a dedicated server, run the file, crossloop.
If you use the Windows binary, download the server and maps here. Once the download is complete, just run the exe files and press yes or ok on all questions. :) Open the Start Menu, find the Crossfire Server entry, and choose Crossfire Server in this menu.
The same as the Mac OS X binary. :D
The same as Mac OS X again. :)