Default free level in Pro Sites?


I'm working with Pro Sites.

When the users registre for a site on my network, they can choose between to upgrade for a higher level now or later. When they choose "Later" they are redirected to the Pro Site Upgrade site. I thought that by default there was a free level.
I have made 3 levels until now. Level1: Basic (Free), Level 2: Pro Site 1 and Level 2: Pro Site 2.
Have I missed something here? Is it the right settings for the levels and what with the signup site where the free level is not there.
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Best, Tim