How can I earn money from Google ads?

Join any Affiliate Networks (Commission Junction, ShareASale, ClickBank, and so forth.)
Apply for different affiliate member programs in a specialty (e.g. Payday Loans, or Web hosting, and so on.)
Promote the affiliate program that offers the most extreme payout and with a decent reputation.
Sign up for Google AdWords (utilize free coupons)
Start your promotion campaigns by making advertisements and the correct keywords (utilize long-tail keywords)
Your advertisements show up on real pay-per-click Web Search Engines like Google, Yahoo, and Bing.
Potential clients click on your advertisement and finish a lead/deal.
You will learn how to earn from Google AdWords, as you will earn the commission by means of your affiliate network that ensures the lead/deal.