Some tips for your wordpress blog before you can optimise for search:
w3c code validation
meta tags / sitemap
once you have done these basic things, then you need to check your inbound links, and make sure none of them are causing 404 errors, if they are then 301 them to the correct place
make sure your content is readable by humans too. and make sure your theme is readable by humans!!
you should now have a decent platform to actually start optimising for searches.
I just ran my site through the nibbler free test, and managed to get 8.0 – thats pretty good, since my inbound links are just about non-existant. it means that im in a strong position to start with. as should you. search for nibbler and test your site, and see what it says.