Uhm even coming from you Mike, no question is dumb
Almost all ranges DO NOT allow you to draw & fire from a holster. (Nothing like never being able to practice real world scenario's ). So the short answer is it's a 98% chance you will not be using a holster. At my gun club (Scottsdale Gun Club [full auto avail] ) You may draw from concealment or a OC holster but you must first receive training from a "Range Master" (they wear jedi capes) aka take a class & get cert. to do so.