Welcome to YT. You may have to pee pad train him for a little while because he should not be going for walks until he gets all his shots. You can set them down at the door and he will go there. It would also be wise to get him a little hoodie to wear when he you do take him out, preferebaly carried in your arms or in a carrier
He's very young and won't get the hang of potty training for A WHILE.
Good luck.