Hmm tuff question, yes and no. You cannot expect wonders from Adsense straight away most begginers only get a few cent every week. Traffic will always be the key, it works like this.
Built Site - Traffic slowly increases - Build credibility provide useful information - Return visitors and traffic still increasing; promotion continues - put a few adsense units in where people are likely to click - revenue begins building very small - oh they can't keep away more revenue (couple more ad units) - constant content - success
Read lisa article on adsense clutter!
http://blog.2createawebsite.com/2007...ense-overload/
Most people give up, dont! you will succeed if you keep your mind at it. There is no rich quick solution apart from buying lotto tickets everyday! Stick with it and good luck you will reach success and perhaps even become your own boss!