first, it starts with what type of school/community you live in, and how many people wish to be in your club. tools like your athame defiantly will be out, and it should have more theory than circle work since people might say you're doing 'black magic' and cursing people. maybe only once a month you should practice spell casting if at all. magic really isn't that important.
before addressing the person in charge [be it a teacher, principal or even the school board] write down some information in great detail. explain what wicca is, what the beliefs are, and the thing your club wishes to accomplish.