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1) Admin able to make export/import in all component. Book Library - Joomla eBook Extension has Import/Export feature.
It is general setting for component.
You can get more in our documentation
Exporting books to CSV in Book Library
Exporting books to XML in Book Library
Exporting books to Full XML in Book Library
Importing books from CSV into Book Library
Importing books from XML into Book Library
Importing books from Full XML into Book Library
All that you can find on our website, tab - Documentation
2) User can upload their own book, all books display in My books menu.
You need create menu "My books"
3) If you want create your personal collection, you need create menu in Booklibrary component Wishlist
To see books in your collection you need login and go to menu Wishlist
If you would like any further information, please do not hesitate to contact us too.