Do I need to remove the OEM bumper to install this?

Yes. You'll need to unbolt the factory bumper, then bolt the new cover into place using the same mounting points. Disconnect any sensor wiring from the OEM bumper before removal.

Will this work with my stock fog lights and sensor cutouts?

Check your vehicle's OEM bumper hole locations before ordering. If your factory setup includes fog lights or parking sensors, verify that this cover's openings align with your cutouts. Modifications may be needed depending on your specific configuration.

What should I do to prepare the surface before painting?

Sand and prep the surface with your standard body shop process before applying basecoat and clear. Your paint supplier can recommend the appropriate primer and paint system for FRP.