Publishing
You easily know enough to design your own game and publish it. You could even just make some modifications to one of the games from the book. Perhaps the platform game with some better level designs and new graphics.
I decided not to do a step by step guide to publishing on Google's Play store because the steps are not complicated. They are however quite in-depth and a little laborious. Most of the steps involve entering personal information and images about you and your game. Such a tutorial would read something like:
Fill this text box, now fill that text box, upload this image etc.
To get started you need to visit https://play.google.com/apps/publish and pay a modest fee (around $25) depending on your region's currency. This allows you to publish games for life.
Note
If you want a check-list for publishing take a look at this https://developer.android.com/distribute/best-practices/launch/launch-checklist.html but you will find the process intuitive (if very drawn out).