Re: How do you plan on using the main blog?
I typically use it as a blog for the purpose of the website itself. A place to talk about the whole community. Then I make my own blog that I use to blog about myself inside the website, sort of as a guide for other users to follow.
I also tend to create a different custom theme for the main blog that other users cannot use. It helps to visually separate itself as something maybe a bit more important and website specific than the others.