So How will you know the Pages with lots of Visit from Search Engine ?
It is simple you just have to learn how you can track your visitors from Google Anaytics. I have made a post about Google Analytics function and how it can help you gain more visitors. You have to remember that those visitors will give you good earnings if your ads are properly placed.
After knowing those pages that gives lots of visitors from search engine you may now put the Google Adsense link codes that you made in Adsense site. You can directly paste it with in the post or you can use Adsense Ad Manager Plug-in ( I have not used this one for a long time ). It is up to you to decide.
What Size of Google Adsense Links ?
I use 180 x 90 with 4 links to display. Well you can experiment in your site on what will be the bet option.
Where to Put the Codes ?
Well it defends in your content, you can put it just after the title or your can float it in left or right, well it is up to you to decide. You have to make some experiments in order to get the highest CTR. ( Click Thru Rate ) from Google AdSense.
Assurance of Success
Well it works for me, and I think it might also work for you. I also think that since search engine visitors are looking for information, any links that they will see in your page that relates on his aim will be clicked.
I also have other Adsense and Basic Seo Tips that was posted a year ago.
Testing if it Works
You can record your Google adSense earning and stats today as you baseline or you can install click aider to know what part works best. But of course driving Google Adsense BOT only to your content will help to get a related ads for that particular post. You also have to take note the CTR of your new codes after a week. Having about 4% to 5% CTR is a good sign already but if you could make it higher it will be better.
In all your experiments you should always have a baseline so you know if your being successful or failure.