PR is mainly depends on the number of backlinks.. But, as far as I noticed, the quality of the backlink pages also matters.
Page rank is calculated based on the number of back links that you are getting. In order to create back links, engaging on the techniques like blog commenting, article submission, forum posting, social bookmarking and networking, classified ads and press release helps. Just make sure to create back links from relevant and DoFollow sites because Google gives more value on them.
Pagerank is all about backlinks, so try to get more backlinks as many as you can. Much better if the links are coming from sites with high pr.
Google Give you Pr when they look you have quality back link you need to build up back link for high Page rank which can be done by Directory Submission, Article Submission, social bookmarking, Press Relies distribution, Blog comment
wide you link popularity, just do link exchangees with others and lay your links online, and you should renew your site very often.
being a newcomer you suggested a lot about making page rank high. also focus on relevant back links and fresh content.