there is no specific stats you need. you need quality content in your blog/site. if you have quality content you will get more traffic. more traffic will bring more $
There's a lot of ways to earn money online. You can use Adsense or affiliate marketing or CPA or sell your services. Pick one of those.
Learn and implement. However it depends on niche and traffic. If you have a low paying niche u will require high traffic and if site/blog has high paying niche then few clicks can give u 1$.