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I think you're asking several questions all at once. I'm going to respond on just one, the error message about formats.
Highlight the book in the main display window. Open the book panel on the right (if it's not already open). I believe there should be a listing of available file formats by default. If it says LRF & MoBI, then both ebook file formats are already in calibre.
Alternately, you can check on the Book Details (highlight book, right click, book details in context menu) window. This contains all the info from the Book Panel, and more.
Does this answer your question with regards to the error message?
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