Questions About Blogging (by a Fairly New Blogger)

At the risk of sounding too green to call myself a blogger, I have a few questions that I would love to ask those of you who are more experienced in the world of blogging.  Whereas I don't see myself becoming a professional blogger, I have heard of several opportunities to make good money writing posts and would love to try my hand at this.  One website in particular said they would only pay for posts that are published on blogs that have a Google Page Ranking of 4 and above (regardless of whether the blog is your own or you are guest posting).  Subsequently, most of my questions involve Page Ranking and Networking.  Please help!