The file name is the name of the file on your disk, that you give when saving the PDF (and that you use when uploading it).
Document properties are set in the Document Setup under Document Information. Note that there are two tabs, first one only includes Title, Author, Keywords and Description. Second tab adds Publisher, Contributors, Date, Type, Format, Identifier, Source, Language, Relation, Coverage and Rights.
I have to confess that I don't know how even half of these are used:)