Start with the camera's neutral settings and then play with combinations of shutter speeds and apertures. In learning, I recommend "shoot anything that moves...and some things that don't" meaning trial and error. Experiment by shooting three passes of different locked-down shots...one underexposed, one over and one you think is "just right." Then when you import into your edit application, you can get to know the difference between your camera monitor and computer monitor... this experimenting will payoff when you're under the gun on a real shoot and don't have time for multiple passes.