I used quarto for my book as well and have a write up, https://andrewpwheeler.com/2024/07/02/some-notes-on-self-pub...

One nice thing about Quarto, is that I could have different fonts and formatting niceties for the epub vs PDF version (which the PDF version is the one I use to sell a paperback copy).

Additionally wrote a little script to auto-translate the contents from the markdown, so currently have the book available in Spanish and French as well.