OK. what about this article? Probably i just misunderstood http://www.mattcutts.com/blog/text-links-and-pagerank/
Depends. If that text add is placed on the good web sitre and have direct links to you - that will help your PR
yes. This article mentions about buying links and paid links. That may effect the page rank and so on
Recently i came across Hubpages while making my research on different ways of making money online. I read so much about Hubpages and heard lot about it as one of the best ways of earing money online.
Page rank is based on backlinks you improve your backlink submit your site in high PR site and not only High PR also popular and related for you.