Select multiplayer, choose Custome Game, flip through the game variations all the way to the end. Enter Machinima mode. Like practice mode. You can roam all the maps yourself for learning or hiding and shooting knowledge or choose a blank screen and try out all the guns. Good to get familiar with the different areas. Also I believe you can do more in Machinima mode like green screen effects, etc. So I'm curious to learn that from this thread as well. Great topic.