Thanks everyone for your responses. I was planning on keeping the first few meetings pretty simple at the start, and just going through basic terminology and a simplistic overview of the process. My plan to keep the more advanced people who show up engaged was an idea I got from Doc in the BN Archives. He suggested assigning people a topic and have them give a presentation to the club. This way they can learn more about something they are interested in, or know little about, and it gets more people involved. Also, for what its worth, while I have put fliers and other advertisements about the club all over campus, I mainly targeted the chemistry, biology, and engineering buildings. I figured these people would be most interested in learning about beer, and would understand it better as well.
Thanks again everybody!