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WordPress H tags are usually built into themes, so it is probably not that important. H1 is already not as relevant as it use to be, but still good to have. H2-HX, is not really that important. As mentioned a lot of themes and templates have these tags built in, and if you want to check, just view source on a page. Or you can use SEOmoz On-Page crawl.

A great way for you to improve the page rank of your website and blog would be to listen to what 'kellymandingo' said: try and focus on getting unique quality content added to the site and build your links. Some other things you can do to start 'fast-tracking' your efforts to boost page rank include adding things to your site like 'rel=author', building your presence on Google+, using social media channels and article/PR directories. Another great way to work towards improving your Page rank would be to guest blog on another person's site. Not only will a guest blog spot, in all likelihood, provide you with a backlink, but it may open you up to an audience that you may previously never had exposure to. As a result, you may be able to leverage this relationship into other guest blog opportunities (and earn more chances to build links), gain more traffic to your site and improve your relevance as an 'authority' within a certain industry or niche. Beyond that, have you considered buying links from sites like linkmarket.com? It has been at least 2-3 years since using this strategy (and the links can be a little pricey), however, the links are coming from sites with a higher PR and can help you get more domain/page authority in a much shorter period of time than it would take you building these links 'organically'. Anyway, hope this helps...

if you buy SEO for money site it will kill you :)) but ... if you buy for 2nd or 3rd tiers so far so good