I would recruit the best people I could find and set up profit sharing, medical, 401K.
Knowing that sales of new cars only gives the franchisee a nameplate, I would cater to all makes and models within reason for my service dept and bodyshop. I'd have a good manager for both as well as my parts manager that would work closely with my general manager to make sure the overall business model is being pursued successfully.
People may see the sales dept as the front line for
PR so I damn sure would treat them with respect. No "take over" sales, only straight up sales. I'd gear my sale people directly to the demographics. If downtown in a city, all wear suits. In FL all wear open shirts. Anywhere in between deserves its own consideration including dressing down a little on weekends.
I would not open on Sunday in a lot of places. If I were in an auto mall and everyone else was open, that would be different. I would do as much for the community as possible including having a good shuttle service and participate in community events like sponsoring a kids ball team and taking cars to local shows.
With higher than average wages and commissions, I'd have a 3 strikes firing policy: a talk, a warning, you are gone, even on the small stuff like dress codes.
The biggest thing I think I could do would be available to the public and to the employees. I was once told a good manger has not that much to do. I would strive to be able to shake the hand of every new and used car buyer. IOW, I want to enjoy working there as much or more than the employees.
I would want to buy a car from me or have my car worked on in my place.