Unfortunately, due to the flexible nature of the new compile features, it’s hard to determine if you’re starting from a good foundational knowledge of how it fits together.
Rather than try to address all of your issues, let’s start with the fundamentals.
- Are you familiar with Document Types? How they’re assigned (either automatically by heirarchy or manually) to each binder entry?
- Are you familiar with how you assign each Document Type to a Document Format in the Compile window?
It sounds to me like you’re trying to do all your formatting in the editor, which is fine, but you have to be aware of how that translates into your compiled format. Which brings me to…
- What output format are you choosing? Since you mentioned blogging, I assume HTML? Or does your blogging software accept some other format?
I think establishing all of the above is a good start for anyone trying to help you get this all sorted. In the meantime, have you taken a look at the v3 tutorial, especially the collection “What’s New in Scrivener 3” that you get to via View->Show Collections? That covers section types and compiling basics.