Each collection has metadata that is used to organize and search the content.
Title - name of the book on the cover. For example: Absolute Beginners - Clarinet
Author - the name of the publisher. For example: Kjos, Music Sales, Furtados
Cover URL - it should point to a place where the book cover is stored (don't point to Amazon or other public service, rather use the URL that a publisher has provided)
Instrument - For example: Clarinet Bb, Piano, Guitar, Band, Voice
Type: For example: Method Books, Scales
Series: For example: Absolute Beginners Series, A New Tune A Day.
Please refer to the actual metadata file to fill in those. Capitalization matters!