I wouldn't be taking him on walks in the neighborhood without at least 2 and really 3 rounds of the parvo vaccine. I suggest just sitting on your front porch with him and letting him watch and observe. My little man did that before he had all of his vaccinations. I would leash him up while I washed the cars and he would just watch in guard position, lol.
@ 16 weeks now he is well adjusted, not timid at all, generally aloof with other dogs, but friendly if I introduce them, and he likes people if I say they are OK.
You really should just be working on basic stuff, getting him on a daily routine, and potty training during the next week or two.
@ 12 weeks my lil guy was unwalkable, he thought his leash was a tug toy, lol.... Now he walks with pride quite well.