Hi

1)Move them to the Library folder in the Itunes folder
2)go to 'add to library under Itunes file menu, you will then get a window to navigate, go to Itunes library folder and chose to add these.
3)You may get duplication if you have other files in this folder, if you do then select one song and sellect all under edit and clear,
4)back to 2 above to make new library

Phil