Finding records with no tags & more

I'm a new Zotero user: 1) I love the program, 2) I may not have "discovered" all the features yet. That said, I request two things: 1) a way, probably in Advanced Search to find all records with no tags (so I can tag them); and 2) When I drag a PDF into Zotero and it can't find metadata, can there be an option to build a citation record around it instead of the current method of building a separate record and dragging the PDF in? The latter is awkward in a large database.

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