Um, with this new religion, are there any rules o commandments? Any special celebrations?

Well, we worship the Cullens obviously, and that includes Bella. The only celebrations that I'm certain of are Edward and Bellas birthday. tu believe that the Cullens are real and that Stephanie is the (or one of the) best authors ever. tu believe that if tu are good on Earth tu will spend eternal life with the Cullens, and if tu are not then tu will be sent to James' cave. I think that's decided por the Volturi. Umm...OH! And tu should read at least a page of a Twilight book a día :D