How many Adsense Page Impressions before I start making money?

I get 300 - 400 page impressions a day from my clothing site - http://www.gemclothing.com and receive about $1 a day. It's worthwhile experimenting with google ad placements as you can often get better results. Google itself has some great tips on placements, I have also found youtube to have some video's on placements. If you are adding multiple ad groups you can ign them different group names to yse what perfroms best. Have a look at http://www.adsensebundles.com to help set up adsense websites quickly.