binder VS olivetti

Doesn't help your export problem, but you may be interested in https://github.com/rnkn/binder. It's a mode inspired by Scrivener.

Have you looked at rnkn/fountain-mode from the same author as olivetti-mode? It is for screenwriting but you may be to use elements of it for your passages of dialogue? They also wrote rnkn/binder which you may find useful in your writing projects.

I use projectile to manage my writing projects (both books and blogs) and it works well for me. binder is also good for navigating between files in a book project.

I also use writeroom because I prefer its simplicity, but worth mentioning that olivetti is the more popular writing mode.

There are nice looking distraction-free setups with https://github.com/joostkremers/writeroom-mode or https://github.com/rnkn/olivetti or https://github.com/joaotavora/darkroom or https://github.com/rougier/nano-emacs

For batteries-included packages that give you dedicated prose-writing modes, see also olivetti and writeroom-mode.

You could use olivetti-mode or Writeroom mode.

Another option is the Olivetti package. https://github.com/rnkn/olivetti

Don't have a specific tutorial except to suggest setting org-mode to use olivetti and a nice variable pitch font for writing prose. You might also like the poet theme.

If you want to try out some third-party packages in the beginning, I think the most "bang-for-your-buck" you'll get is with Avy. Also, expand-region. And specifically for writing: olivetti-mode, flyspell, dictionary, and Nicolas Rougier's Nano and Elegant Emacs setups.