How much could I make from ads off my blog?

Realistically here,
I think I have a good idea for a blog and I have thought it out pretty well and I was wondering how much money could I make off putting an ad on there for people to click on?

Could anyone throw out some numbers about how many visitors I would need a day to make any money?

I just need some ball park estimates on price per click stuff
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ppc w adsense is usally from .01 to .75. mostly around .20, but it varies by the topic.

only about 5% of visitors click on ads, so usually you need lot of traffic to earn much. But then even most traffic will pay for hosting and time.