Please check these topics first.
There are many ways to do SEO of you blog. Basically, two types of SEO are On-page SEO and Off-page SEO. On-page SEO means improving meta keyword, meta description, URL’s, outbound links, content and Off-page SEO means social bookmarking, web 2.0 submission, directory submission, etc.
If you are familiar with these, that’s fine. Or to find an affordable website development comany who also provides best SEO features should be the right option.