I have two years experience in working with adsense. Beginning with adsense is so hard at the first time. You can’t hope to build a website having adsense placed on it and begin to wait for money coming. You have to work hard to get good income using adsense. There are some advices for adsense beginners and for anyone who is working with adsense looking for something to increase earning.
Increase keyword density : try to include to your contents as many keywords as possibleUse high paying keywords : you can find some high value keywords hereTarget your content on a single topic: it makes your contents better and deeperSubmit your site to search engines : this is important, remember to do it,see how here or See if your site is indexed by Google hereLink exchanges can be used: this works well sometimesSubmit to directories : a way like link exchangesUse rss feeds : it reminds your visitors the exist of your siteMaintain adsense channels : try to add each adsense code to a channel for easy stats and tracking clicksUse metatags: find more abou metatags hereWrite content everyday : now you know why I recommend you just need to have one blogNever click on your own ads or trick your visitors to click on your ads : you are making adsense to ban your own account when you do thatMake a comment on other sites with your links(useful comment not just links) and increase the appearance of your blog or site to attract visitors