Having a tasting, or other type of presentation (style, technique, etc) would certainly be a big plus and would keep people interested.
Beyond that, at a first meeting, I'd want to discuss what the attendees would like to see ongoing - frequency & location of meetings, goals of the club, upcoming events (beer festivals, pub crawls, possible brewery visits etc), get a sense of how many of brewers (or interested potential brewers) each attendee might know as possible future members, etc. Really, what you want to do is see what the attendees would like the club to do or be like.
You want to have your answer to these questions (and others that may come up) ready to help spark discussion. Do you have any sense yet of how many may attend? You don't need a large number to get things rolling, but certainly consider how you are going to publicize the event - beer shops, beer bars, homebrew supply shops (if any), etc.