how adwords, adsense work? how much can be earned by such sevices?

Tweet

Hi everyone, i have a blog and i want to use adsense for my blog. i am a fresher for this please tell me what are the steps should be taken? how much it pays (approx.)?? how does it work?? Please be as descriptive as possible so that me and many others like me can get more and more knowledge about all this. thank you in advance for your responses :)