Rules of AdSense
When you sign up for Google’s AdSense, you will be asked to agree to their “Terms of Service” agreement. This is one agreement which you should readand make sure you fully understand everything on it.

Google has very specific rules as to what you can and cannot do with their AdSense ads. And Google is very serious about their rules. For instance you are prohibited from asking your readers to click on the AdSense links. You are totally prohibited from clicking on the links on your own sites. You are also prohibited from putting Google AdSense links in pop-ups, pop-unders, or websites with any type of pornographic material. You are only permitted three AdSense boxes per website page. By understanding the terms of the AdSense agreement it will go a long way towards helping you tostay both ethical and profitable with their program. Ignoring their terms of service will only cause you problems and likely get you kicked off of the program forever.
Google tracks websites which are created with a bunch of junk content specifically to get AdSense clicks. Google does not like splogs and goes afterthem with a vengeance even encouraging other bloggers to report them when they find them online. These sites generally copy content from other websites or free content sites, and then post it on their site solely for AdSense revenue. This is against Google’s policy and they will pull their ads from these sites when they find them. As an ethical blogger this is actually agood thing for you and your success because it can keep the splogs from getting higher search rankings than your real and valid blog which you put your time into creating and keeping up to date.
AdSense for Search
Google also offers a companion program to AdSense which is called “AdSensefor Search.” The AdSense for Search program allows you to host a Google search box on your website or blog. When a visitor to your website searches via that search box you will be paid if they go on to purchase something online from the search. In other words, Google does not pay you for the search itself, but does pay you from any revenue earned from the search which originated on your website.
AdSense for Search can be a great income generator for you. Assume for a moment that your blog is about appliance repair. Someone finds your site that is looking for information on the problem they are having with their washing machine. You have a Google Search box on your blog. After the visitor is done reading what you have suggested the problem might be, they decide to go on to search for a new washing machine. Maybe you had a review on your blog of a good washer they might consider buying. If they buy this washing machine from the search then you will get part of the revenue from that purchase because the search started on your blog. How entirely cool is that? All you did was simply host a search box on your blog!
How Much Money Can I Make from AdSense?
So, this all sounds easy so far and you want to know how much money you can earn through AdSense and AdSense for Search, right? The answer to that question is that it depends. Sorry, I know that’s not a great answer, or the one you were likely hoping to hear, but that’s the best answer anyone can ever give you. Anyone who gives you a different answer is lying to you! Google does not release how much it pays for various clicks. The money youcan make from AdSense and AdSense for Search depends largely on the volume of traffic to your site and how often you get clicks on the Google ads.
Obviously the more traffic to your site then the more potential clicks you will receive. No one knows how many visitors you will have an no one can tell you how many of those visitors will click on your ads. It is simply impossible to know.
What most people do know for sure about AdSense is that some clicks pay you mere cents and others pay a few dollars for a single click. It all depends on the specific topic and very specific keywords for the ads. For obvious reasons, Google does not release which clicks pay more and which pay less. This is one of those things you have to try and guess about.
The single absolute best thing you can do to insure that you make the most amount of money possible with AdSense is to set-up a quality blog with a good topic, post quality information on it regularly, and promote it to get the maximum visitors possible. Using this model you will make the most money possible from AdSense without having to play games with Google or your readers.