Explain It Like I Am 5: Using Lens VR on an older lens with a Z series Camera

I have a Nikon Z6iii and a Nikon Z7. I own an FTZ adapter and a friend loaned me this 70-200mm f/2.8 lens to volunteer at an event.

I am a bit unclear how the 6iii's internal VR will work with the VR setting on the lens. I have heard I should not run both at the same time. Also, the setting that switches between Sport and Active has confused me a little as well.

I just want to take the best photos possible. It will be a darker environment (sort of a charity runway modeling show), and I want to use the best settings I can.

The VR and Sport modes are new wrinkles for me. Also, I intend on investing in a Z series medium telephoto zoom for the future, but it is not in the cards at the moment.