I was told that I can not take my 10 week old puppy out side

I have a Shizu and he is 10 weeks. He does not see the vet again for 3 more weeks. I was told by the people that we bought him from that he can not go out side until he gets more shots because he could get sick.....Ok well how do I train him to not p.p all over my house. I have him on training pads and about 2 out of 10 times it works. I need some advice!!