Do I need new bolts to install this, or will my old hardware work?

Test-fit with your existing hardware first. If bolts are corroded or damaged, replacement fasteners are inexpensive insurance. Most installs use the original bolts if they're in decent shape.

Will this work with my truck's ABS system, or do I need a separate tone ring?

The ABS tone ring is already integrated into this assembly. Your truck's ABS sensor will read it without any adapter or additional parts needed.

What tools do I need to swap this out?

Socket set, jack and jack stands, and a breaker bar for the hub nut. A bearing puller isn't necessary since the bearing is pre-installed. Refer to your service manual for torque specs on the hub nut and mounting bolts.