Once your book is ready for publication, you can submit it to Amazon's Kindle Store via
Kindle Direct Publishing (KDP). I suggest that you download and read the
Kindle Publishing Guide there if you haven't done so already. You can access the KDP Community Forum from that page too, which is a good resource if you have questions. It'd be a good idea to read the
KDP Knowledge Base files and the
Help Topics too.
You may want to download Kindle Previewer so you can see how the .mobi file will look on the Kindle and Kindle Apps, to check for proper formatting, etc. That can be found here:
http://www.amazon.com/gp/feature.htm...cId=1000234621.
I hope that helps to get you started! I haven't gone through the Amazon Kindle publishing process myself, but it looks like it's quite easy, assuming the file is properly formatted before submission.