How should I do this?

Simple, you don't make it.
There's already a Geek club: link
Always check if the club already exists or not. If it doesn't, then you simply make it and anunciar it.

Well yes, I say you should go right ahead & find a couple friends to help start you off. Tell others about it por spreading the word around @ school & once numbers grow too much to fit in your house, try finding a public place to meet, but don't forget to keep saving up while there's only a few people/yes, you do need money. Once you've hired out a hall or something, start advertising it online (because you don't want strangers knowing your address!!) & if things continue to go well, then talk to some professionals about possibly making it into a real business (people pay for membership); seek help if that's what you want to do. Good luck & have fun :)!!