Congratulations on your soon to be puppy. I am sure the breeder will give you lots of tips on how to care for her, including diet. Most here suggest you feed what the breeder is feeding for some time to minimize changes the pup has to adapt to. Then you can slowly change to the new food of choice.
Dog Food Advisor for me is a good start and it does give lots of info on ingredients etcetera. However the star rating can leave a lot to be desired, so it is a good idea to research the foods yourself and take advice of those here and their food choices and experiences.
Good luck and please let us know when you get her, with pictures if you can do that.
