Try looking into the Mustang Unleashed experience that comes with purchasing a Mustang. They will give you some of the driving courses you’re looking for and will help you learn the car.
I think if you go dark horse you have to go handling package. Otherwise just get a GT premium with the PP, minus the tremec of course. I really want to get into track days and drag strips so I went DHHP. If you just want creature comforts stick with the GT premium. You don’t get all the coolers...
Go to the live chat and just give it a shot. They may be able to update the owner. There’s a good chance it may have not gone out to the original owner so you may have hope.