We had a similar set up in my old Cessna syndicate. Any new members had to complete a familiarisation flight with the nominated club rep. He was not an instructor but rather one of the more experienced members of the group. He did however treat it exactly as a 'familiarisation' flight, almost a bit like test driving a new car...i.e. heres the relevant buttons and switches, here's the POH, logbooks etc, here's how the gps and autopilot works. There was then an input re the group rules and online booking etc.