There is no built in flash. It has a mount on it for a flash you can buy. The settings depend on the lighting and other factors at the time you take the picture, what you are taking a picture of, distance to it, how much motion there is, etc... there is no single best setting. Read a bit about how to take pictures, lots of guides out there and experiment with your camera. Or just set it to auto and let it select what it thinks is best.