
Hi,
I'm guessing that you are in the US or Canada, so I would suggest you contact the AKC or CKC for details of Labrador Breed Clubs, who I'm sure will be delighted to help you with the details. Otherwise I suggest you invest in as many books about the breed as you can.
Basically, a 4 month-old puppy should be on three meals a day, of either a balanced puppy food or good natural food. His breeder, or whoever you got him from, should have given you a detailed diet sheet. He shouldn't need bathing more than about twice a year (if at all) because he needs the natural oils in his coat to make it dirt-resistant and keep him clean and healthy. At his age he will only need two or three short walks each day of about 20 minutes each. Take him to as many places as you can to socialise him, and don't let him run up and down stairs.
Hope this helps.