Page rank is not matter. Visitors is the most important factor for earn money from website. If you have good and power visitors? You will try > Google AdSense, Affiliate, CPA.
you need to comment, make a blog guest post to most website that has a volume of visitors. You can try comment here.... www kwentology com it has a dofollow commentluv. Just don't spam.
You can start affiliate marketing with amazon.com. If you have good writing and seo skill then you can earn large amount.
There are different ways: The most used technique is probably affiliate marketing while a more conservative way is selling blog posts to various sites in your niche on your own or through a marketplace for blogs, where you usually find more buyers.
Well.... have you tried adsense? (earning is depend on traffic though). You may sell links to the webmasters in your niche as well.