Ok remember when you installed the game? find that folder and open it, then find the folder "maps" and click on it, when you did that open the "Download" folder press save and open warcraft 3 and there it is in the download folder!
That wasnt hard!
For more maps http://www.hiveworkshop.com/forums/maps.php?status=g&d=list&r=20&u=Slayer1995 <--