Look to what is most popular. Most blogs are at a subdomain....otherwise is it is at its own URL it acts like another website.

And subdomain are treated loke a seperate website too....but it will more easily transefer page rank to the top level domain.

Great information!!!! This is all very interesting and can be challenging to learn how optimize rank. I am in the process of having AgentImage create a website for me and I look forward to executing the great ideas that many members here provide. Mahalo!!!!

Once your blog is setup and configured, there are plugins you should add to your blog, so that it will be index correctly. The plugin that I think is important is the All in one SEO pack plugin.

This provides your blog post with the all important title tags. as well as a place to add keywords.

Just so that you know one of the most important onpage SEO factors is what is between the:
<title></title> title tags.

Example, I have seen my sites rank for keywords specifically within the tags.

There's a learning curve to optimizing a blog. but if you are able to post once a day, that will really help the popularity and rankings.