First, go read the Twelve Principles of Agile Software.
Second, figure out from what you know how to achieve the principles that are most important to you.
People constantly make the mistake of expecting Agile development to be a Silver Bullet or a rigorous set of processes that you need to adhere to that will make your software development successful.
That's not what it's meant to be. The fact that you already have a list of 15 "Best Practices" scares me a little. Don't take it too seriously and don't over-think it. If you find that you missed something...get it in the next iteration.
