I posted several times about my problems to convert to eBub and Kindle format.
Now the customer service of Amazon wrote me,
I should make a DOC file, this is more easy to convert.
Now any plans to implement "Output as DOC" or "Output as ePub" into Scribus?
I would look more to a program that outputs to ebook format such as Sigil (which I've not used). Alternatively PagePlus outputs directly to ebook format. For a single user, emailing a .doc file to your kindle will convert and download to the Kindle, but I suspect this is not what you want. Amazon will accept .doc format for publishers, but I don't know how to get them to convert and give you the mobi file.