make a new folder usermaps in your cod4. Save the map in there. Then start the game and go -> mods -> modwarfare and then start new server and start a map
No longer required (I think) to use a mod to play a custom map.
In your "Call of Duty 4 - Modern Warfare" folder, add a folder called "usermaps".
Inside that folder, create a folder called "<mapname>" replace <mapname> with the maps name...
C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\usermaps\mp_gmx_matmata
Now, hopefully you have downloaded a zip file. Open that zip file and place the contents inside the above folder.
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Hay dude, not been playing COD4 much, im trying to lear Radiant to make some of my own custom maps, hope to see you lot on CJ server hopefull this weekend.