Will this bolt straight onto my truck without any modification?

Yes. This assembly mounts at factory rocker and frame points — no drilling or fabrication needed. Bolt it in with standard hand tools and you're done.

Do I need to order both passenger and driver side, or is this just one light?

This is the passenger side only. If you need both sides, order a second unit for the driver side.

Is the bulb included, or do I need to grab one separately?

Bulb not included — you'll need to pick one up separately and install it into the assembly before mounting.