what is the default theme now when a user create new wp.com blog? is it 20/11? does that apply to all new users (to get same default theme) or different users get different default theme when they create an account? if the default them is 20/11 for all new users? would that be changed or stay like this?
You know that you can change your theme to any which one you like. Because you are just starting, I’d say you should experiment until you are happy.
dashboard—>appearance—>themes—>make lots of previews
look around here: http://theme.wordpress.com/