Once your app has been processed and a APK file generated, you can then upload to the Google Play Marketplace using you own Google account. Google does charge a one time fee of $25, which is good for a unlimited amount of apps and valid for life. You will need to create several different size images of your launcher icon, along with some screen shots for various different screensizes. Privacy policy, full description and content rating are just some of the fields that must be complete before the app can be published.

https://play.google.com/apps/publish/