just make a adsense account and copy the code they give you into your blogs html. the adsense ad setup explains its self. but there is a help icon next to every option within your adsense account.
first, you can create a blog that related to your keyword. I suggesting that you have the long tail keyword. Then, create unique content to be posted in your blog. Keep posting for a week then put your adsense to your blog. that's the simple techniques for the beginning that i do.. but i think you also can learn here from experts in this DP forum. I'm sure they have more techniques to maximize your adsense click then