Do I need to drill for the lower valance or bumper mounting points?

The mounting points should align with your existing OEM holes and brackets. Verify your bumper's hole locations before installation to confirm fitment with your setup.

Will this bumper work with my front parking sensors?

If your vehicle has OEM sensor cutouts in the original bumper, reference those locations before final installation. You may need to transfer or adapt sensor mounting depending on your sensor type and the new bumper's design.

What's the best way to prep this before painting?

Sand the surface lightly to ensure good paint adhesion, then wipe clean before applying your chosen primer and topcoat. Standard automotive prep techniques will give you the best finish results.