yep, annor pretty much got it right
using that website, on the bottom bar it says AI maps
i just recently clicked it and it doesnt seem to be working
the AI maps are made by a member of Playdota.com
if you navigate to that website, on their menu it says AI map
you must be a registered member of that site to see the information/download
download any wc3 custom maps you download into your warcraft 3 >> maps >> download
if you have not gone on battle.net and downloaded a custom map, the download folder will not exist inside the maps folder
just create the folder itself, and warcraft 3 will recognize it
once your good to go, set the computers on the opposing team, and your team if you wish
easy/normal/hard has been coded to be just that.
no need for forum gold, but theres your step by step.