Poor guy should still be with his mom until 12 weeks. I would recommend a buddy belt when he becomes full grown because they are almost escape proof and awesome. One of our members has an awesome online doggy store.
https://www.wfieldsforpets.com. Right now honestly he is probably to young and to small to be out side walking around on a leash. You might could look at cat harness. He shouldn't get any vaccines until 8 weeks or they are useless and you shouldn't walk him around places until he has all of his shots.