Personally I will be doing it myself (new cars are exposed to so much when it's shipped and dealerships detailers do a horrible job). I will be washing the car right away to remove any dirt on its journey home. Remove any chemicals from the car and whatever wax the dealership slaps on. Going to be doing a very light polish. After I will be using turtle wax graphene flex wax (It's a hybrid ceramic coating with pure graphene. water and dirt slicks right off, car is super easy to clean, and the shine is absolutely amazing plus it last a long time and its easy to reapply). After I will most likely apply a top layer wax (My 280z paint looked really good after doing all these steps). I am debating on also wrapping the front end of the car and hood.
Interior wise I will do a quick interior cleaning, then adding a protectant to all the surfaces to help protect the car from UV then a ceramic coating to all the materials including the carpets to hopefully stop any future water spills and what not.
I also plan on detailing the engine bay right away too if the dealership doesn't.
I plan on getting the 2023 Nissan Z in blue with the blue interior. I'm trying to keep this car forever lol.