I've improved a little in my flying skills, and I'm ready to get a little more serious about working on videos.  In your opinion:

1.  What is the best video editing software program for an Imac Pro?
2.  Where do you buy it?
3. How much does it cost?

regards

1. Final Cut Pro
2. App Store
3. US 299.99

I keep a list of the most recommended editors here.

Hi, thanks for the inquiry, Surely, our valued customers could provide the best recommendation for editing software of your video. Thank you for continued support.

Before spending hundreds of dollars, try DaVinci Resolve.  It is amazing what you get in the free version!