Is this door prehung and ready to install?

Yes. It comes hung in a 4-9/16 inch primed-and-finished jamb with a sill, satin nickel hinges and trim, and is bored for hardware. You supply the lockset and handle.

What does right-hand inswing mean?

The door swings inward, and the hinges are on the right as you face it from outside. Check your opening before ordering, since the handing cannot be changed.

What rough opening does it need?

The rough opening is 38-1/4 x 82-1/2 inches for the 36 x 80 inch door. Frame the opening to those dimensions.

Does the glass let people see inside?

No. The five lites are obscure decorative glass, so they pass light but not a clear view. That suits entries facing a street or neighbor.

Why is this sold as surplus?

It is a one-of-a-kind surplus unit, which can mean a return or a door with minor blemishes. Inspect it fully on arrival, since condition varies from unit to unit.

Is fiberglass better than wood or steel here?

Fiberglass resists dents, rot and moisture better than wood and does not dent or rust like steel. It is the more durable choice for an exterior door in wet or humid climates.