I just retired at president of my highschools anime club. Best advice I can give you is advertise that club so you can get members! and for fun activities, we did what we called a 'mini-con' where we rented out the cafeteria and set up a movie projector like at the cons and watched anime on the big screen all night. It's a really fun activity and gets more people involved in the club. You do need teachers willing to hang out after school and help organise equiptment, etc, but if you can pull it off, it's a fun event you'll definatly want to do again. My old highschools now on their 3rd minicon. good luck! :)