Congratulations!
Is this pup the Yorkie/Biewer mix you posted about the other day?
Supplies can be many - Yorkie guide books, a great vet, Nutrical or Nutri-drops (incase of hypoglycemia), quality food, water/food dishes, kennel, safe toys, grooming supplies, a bed for the pup, etc. Potty pads if you plan on potty training indoors, etc
Have fun!