You should keep him for there diet for a little while as it will help him settle, the move alone could be enough to upset his tummy, and giving him different food might make that worse. James Wellbeloved is a good complete food.
Mine was on it before he came home and and had canned tripe or fresh mince for a while. Your breeder should give you a feeding chart, if they don't there are plenty of breeders that come here that would be able to help you.

I would get yourself a DAP plug-in infusior, it gives off doggy phemones (don't worry people can't smell it!) and that will help him settle. You can get them in pet shops and vets.