Do I need to transfer any parts from my old knuckle?

The assembly comes loaded with the hub and shield already integrated, so there's nothing to swap over. Pull off your old unit and bolt this one in place using the factory mounting points.

What hardware do I need to install this?

You'll need the fasteners that secure the knuckle to the control arms and strut—those are reusable from your current setup. Refer to your service manual for torque specs and any sealing requirements at the joints.

Can I use the brake rotor and caliper from my old side?

The assembly includes the hub, which the rotor mounts to. Your existing rotor and caliper can transfer directly—just inspect the rotor for wear before reinstalling.