ok rule one for DMs. Make shit up as you go.. it can get annoying, but hey sometimes its the fun part. also there are a few other rules that come into play, the rule of fun, and the rule of cool. if its cool run with it, if its fun run with it. if it makes every one stop and laugh go with it. its not about knowing all the details, some of the funnest games can be the ones spanned from an idea, and BSed the rest of the way. one of the biggest thing that is siad in the DMG on one of the first few pages, The DM is always right, even if he/she is technically wrong. as well as that all rules can be modified to fit your world.