NEVERMIND
i am stupid. I missed the FAQ section somehow, idk how.
I inserted the <!--#include virtual="/cgi-bin/blog/?$args" -->

and now the file content shows up/the blog pages exist!

A blog subpage will always have the same template as the main blog page, correct?

so post 1 can't have a different template tha post 4 for example? i tried changing it in the editor but it does not do anything, so i assume that is the case