Good advice above. I would add that you may want to instead of shooting in various places with different settings, you may want to shoot ONE place with multiple settings.
That will give you an idea of what works best in that kind of light.
Check your lcd to see how it is and then make adjustments. Do I need faster shutter, bigger aperture, higher iso,etc?
Post some pics, tell us the circumstances, and you'll get some expert advice.