I would say a good place to start would be in the archived old Edge forums where everything you have asked has been answered.
The efficient use of scanned PDFs depends on which version of the edge you get - the standard large edge, which I have, works very well with scanned manuals. The pocket edge will have some problems mainly centred on the need to zoom the PDF for easy reading and the fact annotations can then be a problem and scanned PDFs do NOT re-flow text.
I do endorse Last_of_the_PEs comment re doing OCR on the scanned PDF if you want to search text. It would also be a great help with zooming but I should mention that there will be some work involved if there a tables and diagrams in the document.
I can't comment on evernote because I don't use it.
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