Mobipocket Creator is another program we need to publish for the Kindle, CJ's Easy as Pie way.
It belongs to Amazon, it's free, and it's perfect to do the real work of preparing our MS Word or HTML file to be uploaded to our Amazon Kindle Dashboard.
Download it at the link below, and be sure to get both Mobipocket Reader and Mobipocket Creator.
A book that will save you a lot more in time than it costs in dollars is Mike Hicks book:
Publish Your Book On The Amazon Kindle: A Practical Guide.