Congratulations on your new puppy.
It's very worrying that he won't eat or drink - actually not eating CAN hurt them, as their blood sugar can drop very quickly which is why baby puppies need to eat four times a day. Sometimes in a new home they are just too excited to eat, so missing the odd meal the first day is not too much of a problem as long as he eats within 12 hours or so.
Not drinking is rather worrying - does he know where his dishes are? Have you shown him - maybe dipped your finger in the water and let him lick it?
Did he seem well before you left the breeder? Was he depressed at all there? Did Mum and the rest of the litter seem well?
obviously the concern is that he is poorly. Has he had diarrhoea, doing normal poos [I presume he is pooing?] If not, does his stomach feel hard/tight - worried he might have swallowed something.
If you lift a flap of skin at the back of his neck does it drop back immediately, or does it drop slowly? [indicating that he is dehydrated]
Has he had some time just shut in his crate or puppy pen? Just to lie quietly or has he just been running mad all the time? Puppies need to sleep and should not be allowed to run until they are exhausted.
Maybe put him in there with his water and food [I'm assuming his breeder gave you some of what he has been eating, a diet sheet etc - you should keep him on the same thing for at least 10 days]
Do you have some Dr Bach Rescue Remedy? You can give 2 drops of this into the mouth - maybe every 15 mins for a couple of hours until he seems brighter [can get it from the chemist]
Have you downloaded the Ian Dunbar books, Before and After you get your puppy - free to download from here,
http://dogstardaily.com/free-downloads
they have the best possible set up and advice on how to raise your puppy.
The essentials are here
http://dogstardaily.com/training/puppys-first-week-home-8-9-weeks
I'm sorry that you have this worry on your first day - if puppy still isn't eating or drinking then I think you need to telephone your vet. Has his breeder telephoned to see how he is settling in?