Do these bolt to factory mounting points or do I need to drill?

These mount at existing factory rocker attachment points — no drilling required. Use the holes already in your frame.

What hardware comes with the bars?

The nerf bars ship as the tube assembly only. You'll need bolts and fasteners to connect them at the factory mounting points — your truck's OEM hardware or grade-8 bolts from your local hardware store will work.

Can I repaint these or do I need to strip the black finish first?

The black powder coat is a solid base. If you want a different color, light sanding will help new paint adhere — no need to strip it down to bare metal. Wipe with a tack cloth before painting.