It really depends on what's included in your map =0
When you export, the game will tell you each and every file that's associated with the map. Write down each one, and go collect them in your "exports" folder. Have friends place these folders in their own "exports" folder. Typically the files will be .fhm, .fho, .fhs, and .fhw (though sometimes .fhs and .fhw files need to be placed into "sky" in order to work)
Any music? Place into "sounds"
Any special/custom textures? Place into "textures"
I hope this was helpful =0