If you have a well-formatted Word doc by using styles, you can upload it directly to the KDP. Download the "mobi" and examine it in Kindle Previewer or sideload it to your Paperwhite.
If you're not happy with the result, run the Word doc through Word2CleanHtml.com online (there are multiple other ways to clean Word docs) and open the html file in Sigil and tweak it there. There's a learning curve, to be sure.
Sigil outputs an epub. (I stick with epub2.) Upload the epub to the KDP and proceed as above.
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