There are no magical number. You need to know,
1) Environment such as lighting?
2) Where will you be?
3) What camera are you using (APS-C, m43, Fullframe, etc)?
In general though, I would try to use a fast lens, the focal length will depend on where I am, the ISO setting will depend on the lighting, brightness, etc, the shutter speed will depend on my ISO and aperture setting.
Hope it helps.