Sablerose,
You can also have a look here:
http://en.flossmanuals.net/e-book-enlightenment/
This manual tries to cover the whole process involved by the creation of an eBook.
If you can read French, the manual "Créer un Epub" (
http://fr.flossmanuals.net/creer-un-epub/) is really interresting and different to the other one.