adsense question with facebook.

I have a few pages. One just hit 15k today. It is growing at 150 fans per day. I wanted to post articles. But I was wondering how much adsense pays per 1000 visitors? And also how many ads can I have on the article page with the images? I've seen some with 2, and up to 25 ads from google adsense on it. Is there a limit of how many ads from google can be placed on it? And a price area? All my fans are from the USA and some from Canada.

Thank you in advance.

As you mentioned that your audience is from USA/CA, adsense will pay you anywhere between $0.30 to $0.60 per 1000 clicks. As per adsense policy you can not put more than 5 ads per page. People who are using more than 5 ads are always at risk of adsense violations.
Hope this information helps!
Best of Luck!