Firstly add optimized and Unique content to your website. then submit your website to high PR Submission sites. It will help you in increasing your websites Page rank.

Google Page Rank doesn't really update that often. I wouldn't worry about the importance of it, even google says not to worry about it because it doesn't update often.

i am agree with the guy.....

create authority backlinks

Get links to your website from high quality relevant websites. Page rank is based on the number and quality of links pointing to your website.

That's very informative question. there are many things which affects page rank. if your sites structure, content and backlinks are good, your keywords ranking will be improve. backlinks should be quality basis. update content with daily basis.
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Some Page rank increase factors

. Directory Submission
. Bookmarking Submission
. Article Submission
. Blog commenting and posting
. Forums commenting
. Rss Feed submission
. Niche Directory Submission
. Business listing
. Profile Linking

First you need remove your low quality back links. than you need to summit high page rank website sure with 30 day you will get page rank.. and also do social marking ....