This is everything you want to know about SEO for your blog from a site I highly recommend, http://yoast.com

This Guide and Video are simply awesome. the video does run nearly 55 minutes but sometimes it’s easier to watch and do. You have the ability to pause the video and optimize in a different window. If you are just starting out, this is fine tuning. Make sure you are comfortable with all other aspects of your blog before attempting this. Additionally, I would like to add, make sure you back up your work before you attempt modifying any code. I have already paid the price for you on that one. If you don’t know how to backup, don’t do it till you do.

You can read it or watch it.