Firstly follow all the adsense rules strictly and choose right keyword for your blog. As well ads placement is also important. It you want you can use auto ads. But, i recommend you must use adsense ads integrate plugins that will help you to increase your adsense revenue. You can choose ads placement as your wish. Make sure place ads on the top of a blog page. It is good for your blog. It will increase your ads impressions and increase the chance of clicks.