1- try to update your website everyday or everyweek by adding unique content.
2- provide inside linking and backlink.
try to make your visitors spend much time on your website.
3- Submit your website to searchengine directories.
I all recommend fresh content on website and submit a quality article with link back to your site on high reputed article directories.Also promote your website through social bookmarking, do blog commenting and forum posting.
SEO in simpler terms is about the process to let your presence felt in the market. I think that it would be a very good thing to have some good benefits as being listed with better rank always pays. The approach adopted to have this implemented in a proper manner is something that helps have better results.
You can increase pagerank by article or blog submission,social media,affiliate marketing,SEO methods etc.I insist that SEO is the best and steady way to improve a site's page rank.I suggest you to use the SEV(Search Engine Visibility)from XnYnZ.com as they provide keyword and suggested topics,submit the site to over 100 search engines and also provide reports which will eventually improve your website traffic.In short SEO is the best way to promote site and gain your desired web presence.
Make sure you make relevant and quality backlinks. use web 2.0 platform to get backlinks. Do guest blogging, this is a nice wat to build quality link with brand value. Bookmark your site on high PR social bookmarking sites liek digg, reddit, stumble upon etc.
Domain age,Quality of the backlinks,Navigation structure of the websit and the content of the website are consider while deciding the page rank for your websit. Make sure all the above factors are clear by your website.