Well, I always say "that depends." Hopefully you
can get to about 8-10 other people who will regularly
come to practice throughout the year. You need that
many for a critical mass to continue the club at
minimum. Also, you need to learn quickly how to get
funding from student government or an "honors college"
benefactor or else you won't be going to tournaments
either.
Of course the best thing to do is find out who runs
the CB IM tournament on campus and "volunteer" to run
it for them. As long as they can get prizes from
your bookstore or some such stuff, you'll be fine. :)