Congrats on your new puppy! Do you have any pics? The things I would have on hand are:
Nutrical
Pee pads
Cat collar w/ bell
Small amount of food breeder was feeding(the breeder usually gives this)
A stuffed animal with the pup's littermates scent
If ur picking up by yourself a carseat
Harness for the carseat
X pen/ crate
Toys (lots of chewing ones)
Bed
I'm sure others will chime in.