Maybe you could join the IBC and see if they have any tips on starting a betta club and having betta shows. I looked on their website (homepage
www.ibcbettas.org), and I didn't see anything there pertaining to launching a local society, but it's quite possible someone there has some good ideas for your enterprise. I think you can send an e-mail to one of the officers of the IBC asking about local chapters. Good luck! I hope you do get your club started, and I don't think it possible to have too few members, if everyone has your enthusiasm.