The hotel you are staying in at Victoria Falls will arrange for the helicopter service to pick you up and bring you back.
They do not provide you with head phones to block the noise on the helicopter. Bring your own or bring ear plugs. I did not know that and wished I had. Wear dark clothing so it will not reflect in the windows.
Victoria Falls from the helicopter ride. This is the only way to see the entire falls. Take the flight in the middle of the day or the bottom of the falls will be in shadow. The flight is short but worth it.