I've got a similar question, I'm also interested in a free trail period.
Also can the initial charge be made as a one time joining fee then a regular subscription payment, for example, $10 to join then $5 a month after that?
Secondly, are expired users deleted or deactivated? For example an expired user may need to be re-subscribed (manually?) if they are late with paying after their account has expired. I'd want to keep the person's info/data as I'm looking to integrate with community builder in the future and want to be able to link back.