First though, you’ve to sign up. Here’s how you do it.
The sign-up page needs for a relatively small number of selective information, not all of which are as obvious as you could like.
First, you will have to assure Google whether you want an “individual” account or a “company” account — whether you are a company with more than twenty employees or practically a one-person show that is just you and up to nineteen others. That is all important for just one reason: it tells Google wherever to send the money. Take a business account and the payments will be made in the name of your company; take an individual account, and they will be paid direct to you.
You will also be able to choose between three different ways of receiving your money: Electronic Funds Transfer, local currency check or Secured Express Delivery. In general, it is better to get your money by direct deposit applying the wire transfer; Google charges for express mail checks.
(What you will not be able to decide is whether you are paid per click—on a “CPC” basis—or for every thousand times you show an ad—on a “CPM” basis. Google decides that for you. Some ads will be CPC and others will be CPM.)
The next piece of information that Google demands is your URL. There’s only room for one web address, which can be confusing whenever you’ve more than one site and prefer to put AdSense on all of them. Don’t worry about it. It will not affect how you use AdSense at altogether, so just submit your biggest web site for now.
The next doubt is about whether you want content-based advertisements — the type of small text ads I have been discussing so far, search ads or both. (Content- based ads are better but I will tell you how to benefit from each so I recommend that you choose both.)
Once you are approved, you will just have to copy and paste a small piece of code into your website and you are done!

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Dear thanks for posting very usefull tips in your website pls let me know how i protect my google adsense account because every time its disable because of invalid click also let me know how i increase more triffic in my website so i can get good earning through google earning.