Don't just blog for money. Concentrate on writing interesting content and developing your blog, money flows in automatically. If you started blogging just because you read somewhere that you can make money easily with blogging, thats not true.
You will have to work hard and enjoy your work.
Do not stuff your blog/site with ads when you don't have enough traffic, you will hardly make any money with less than 500 visitors a day and lot of ads may be a turnoff of for the readers who are beginning to like your blog.
Try different ad placements, use channels to track CTR of different positions and colour combinations.
Do not try to fool Google, they are smarter than you.
Free lunch is only found in mouse traps