! The overall organization of the pages on your site. Essentially this means there should be a logical order to your pages, where for example pages related to a similar topic are grouped together in some logical fashion.
I prefaced this discussion by saying it isn "t necessary to be an SEO expert to get decent SEO results if you keep some basic points in mind and use tools that automate the process as much as possible.
Using Wordpress to build your blog will help, as Wordpress was designed with SEO concepts in mind. You can also choose to use a tool such as Scribe, a Wordpress plugin designed to optimize your written content for SEO purposes.
Other plugins such as the All in One SEO Plugin can help you optimize your content for the search engines.If you have an interest in taking SEO to the next level and leveraging it in a big way to drive traffic though, I suggest you take a look at SEO Networker, a program created by top SEO marketers Fernando Ceballos and Raymond Fong. I just recently had the privilege to sit in on a live presentation the pair gave about this product in Las Vegas, and based on what I saw I can tell you it is a very powerful SEO tool.
However I have yet to actually use this product myself and so can "t personally recommend it based on my experience. I do however respect the work of this well known marketing duo and recommend you at least take a look at it for yourself.
As is true for any product you may be considering, exercise your own due diligence and really consider whether or not it is something that is right for you at this stage in your development as a marketer.