How much is it for a wedding photography shop to shoot a cover sample model a day?

First, it depends on how much the model you hired is worth, and second, it depends on how many photos you took. When I worked in some big photo studios, I hired about 4000 models a day. It is estimated that you won't waste so much money by hiring one like this. I suggest you choose some good-looking friends from your circle of friends and ask them to be your models. As long as you pose, it's not much different from a model. It depends on how you guide her. You should let her pose, not just you. Good luck.