When you pick up your pup just ask your breeder to show you on one ear how to post and then you do the other one with her guidance

I am sure she might know somebody in your area as well to give you a hand with posting if you have trouble.
Ask her to also show you how to do his nails with a dremel,it's the best way to keep his nails short and with the least amount of pain
As for the food just ask her what kibble he has been on, I would say keep him on that food for awhile then switch him over to whatever you want.
With my boy when I picked him up he was being fed Pro-Plan, I kept him on that until he was 9 months then I switched him over to Raw. I just wanted to learn more about feeding Raw before switching him over.