Ok I couldnt think of a better way of working the title so I want to apologize for that. Here is my query, I have a website & a blog (both new & in a new domain) and of course their PR is down at 0.

I post on several forums, have released articles around a few sites. My main flaw at the moment is getting back-links (which im working on via new articles/forums) hoping someone will be nice enough to link me if they find it useful. Also a couple of my clients decide to offer my link space in the footer for an hours extra work so I take the opportunities I get.

But this is my query (well queries). Pagerank goes from 0-10, but is their a specific ammount of in-links required to hit each level, or is their a point system based upon the quality of the links etc, any information this would be really appreciated.

The 2nd query is how often is the page rank updated, it is updated constantly throughout the day or every few days, week, month etc. Please let me know.

I apologize for teh bombardment of questions its just i know how to make a site SEO friendly, but don't really understand the link value to increase PR which is a vital aspect of the business im in.

Thanks in advance.