Do I need to remove the bumper to install this?

Access depends on your truck's year and trim. Some models allow headlight swap from the engine bay without bumper removal; others benefit from bumper clearance. Test-fit first to confirm your approach.

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

Bulb is not included with this assembly. You'll need to source a replacement halogen bulb that matches your truck's OEM spec—your local parts store can cross-reference by year and model.

Will this work if my original headlight is cracked but the housing is intact?

If your housing is still good structurally, you may be able to source just the lens. This assembly is a complete replacement—it's the right choice if the entire unit is damaged or aging, but overkill for a single cracked lens.