k for your first question i believe all you do is select multiples with hold ctrl and left click on the ones you want to delete then when you have selected them all right click and select delete
the ! symbol means the music is in the itunes database but the actual file cannot be found on your computer.
to edit the musics information right click on the song you wanna change and click get info, which will bring up a dialog box with artist and ablum options
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