User account / Start a blog for my Uni

Hi,

This confuses me, so please help me to understand.

I will have group blogs and individual blogs. Some users will want to start individual blogs and some users will want to contribute to group blogs (there will be more than one).

How do I easily explain this to users and ensure they select the right option? "Gimme a site or just a username" is too complicated to explain a concept.

thanks in advance, Ross