No, AF-P lenses are not compatible with the D3100 or D3200. They require newer processors found in the D3300, D5300, and later models to control autofocus and settings.
No, this lens does not have a physical VR switch. Vibration Reduction is controlled through the camera's menu system on compatible Nikon DSLR bodies.
With a maximum aperture of f/4.5-6.3, it is best suited for well-lit environments or outdoor daylight. The VR helps in lower light, but it is not a 'fast' lens for night sports.
Yes, but the camera will automatically switch to 'DX Crop Mode,' reducing the resolution. It is specifically designed for DX-format sensors.