Pantheon Aegir Database settings

Hi,

In trying to take the Pantheon Aegir AMI for a spin, I hit my first obstacle with the database settings during the install.

This may be very obvious beginner mysql mistake but do I need to create the database, user and password before attempting the install?

I tried logging into mysql to create a database and set it up but realised that nowhere in the basic documentation does it mention the mysql password.
I tried the usual suspects , leaving it blank, drupal, mysql, root but none seem to work. I should mention I am trying to login as "root".

Any guidance here would be very useful.

Thanks
Gregg