Publishing on Amazon

I know this might be a crazy question, but how does one get a story published on Amazon Kindle? I know a few authors here have done so. I'm a bit slammed with work and school, and to be honest could use a little extra income coming in ... not that I would make a lot.

Thought about putting a couple of my longer stories such as His Secret up if I knew exactly what I need to do.

Any help I could get would be appreciated.

Torey