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As far as I know (but I'm certainly no expert) the only metadata item required for a valid ePub is the language tag the book is defined as.
In my mind the other important items would be the title of the book and the author.
After that it's pretty much up to you what information you want to include. This could be a description of the book, any series information, date of publication, publisher etc.
When you say 'New file defaults' I presume you are referring to what the metadata content of a new ePub2 or ePub3 is when using File-New in Sigil? To be honest I'm not sure you can change that, but the developers of Sigil frequent this forum, and are very helpful so I'm sure they will be able to tell you more.
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