Your questions were already answered in this very thread. But here go again:
Details of Map File Contents
In-game Map File Layers
Setting Folder Permissions to allow installation of maps
Mapfiend Map Packs Select All Maps and hit the Download button.
Usng Winzip for you Mapfiend map packs
To find out for sure which directory, right-click on the link to EQ, select properties, in the window, select Short cut tab, check out the start in text box. That's the base EQ directory, maps go in the maps subdirectory.