I'm starting to have strong suspicions my thesis advisor has even less of an idea on what's normal style and structure of it than I do.
The clear answer is to copy the style and structure of your best-received term papers if you have any good ones. It's what I did, with generally all right results (to be specific, my term paper style was my natural one and people seemed to like it).
I don't think style should be much of a problem if you've written a term paper or something like that anyway. And structure is standardized enough to be even easier to get down. As long as you don't neglect to put graphs to all of your tables like I did (fortunately corrected for the presentation when my thesis adviser, who had seen the thesis and presumably read it before, finally went 'you know what, this really needs some graphs') you should be perfectly all right.
Of course, this doesn't help that much if your thesis adviser is less on the 'not particularly involved' side of things and more the 'no no no, this is horseshit, simply unsalvageable' kind. No personal experience dealing with the latter, I'm afraid.
You know, there's some things in your post that are absolutely ironic considering that situation.
Term papers are... not really a thing in the strict sense. We've mostly been writing papers as reports, but a good part of them were collaborative, and an annoying chunk was graded on a 'fuck you, that's the grade, you don't get to know why' basis.
You'd think the structure was standardized, but I've been criticized for speculating about the possible explanation for my results in the discussion to suggest what to do with them, which, as far as I'm aware,
is the entire point. And having included graphs with my tables from the get-go... I was told to drop the tables.
And style is far more of an issue of cryptic highlighted sentences with 'fix the style' comment and no indication of what's wrong with it as-is.
God, is it's frustrating.