Some AdSense Basics
The important thing to remember is that no matter the spam in your email says, you will not get rich FAST. You need to have a quality website that Google recognizes. Perhaps the best thing that can do to get started is picking a copy of Joel Comm's book, The AdSense Code: What Google Never Told You about Making Money with AdSense. It is available as paperback, Kindle Edition (least expensive) and as an Audible Audio Edition.
While you are on Amazon.com, also order Vanessa Fox's Marketing in the Age of Google: Your Online Strategy IS Your Business Strategy. It is available as hardcover and Kindle Edition.
I have included links to each of these books on Amazon.
You cannot be successful using AdSense, if you do not have more than a working understanding of Google AdWords. These two books will cover that.
A few tips for pathname and filenames: