Joined: 09 Jul 06
17 Nov 13 11:49 pm
Adding AdSense to your site shouldn't hurt your rankings/chance of ranking -- in theory. https://support.google.com/adsense/answer/9717?hl=en
HOWEVER... Google (since the Panda update) may penalize your site if it considers that it has "too much" advertising, particularly in the top part of the page (above the fold). Basically they don't want visitors to your site to have a bad experience.... you know, you click through trying to find some content, and you're smacked with a screen full of ads with the content all the way down the bottom.
If you're careful to make sure that your content is top quality and receives prominence on the page, and your ads don't smack visitors in the face... you should be alright.
But personally I would wait until I was seeing some steady traffic to the page before I started experimenting with AdSense. That way I'd be able to see if adding it had any impact.