
I'm going to go against the general advice, whilst I agree, don't let your pup wander around areas where other (possibly unvaccinated) dogs have toileted, it is vitally important, imo, that you don't miss out on the window of socialisation. Carry your pup out and about with you if necessary, but get it used to meeting people, vaccinated dogs, hats, wheelchairs, walking sticks, children running and screaming. All of these are normal everyday sights and sounds to us, but completely alien to your pup. The next few weeks for your pup are very influential, it is when your pup will form it's opinion of the world about it, if you like. If that world doesn't contain hats, bicycles, wheelchairs, pushchairs etc, when it does finally come into contact with all these oddities, you will very likely hit a set back.
All manner of creatures pass through your garden carrying goodness knows what, the main thing you need to watch out for is unvaccinated dogs and their faeces, so avoiding popular dog spots and grass verges will keep you away from the major risk. If you have a friend or two with vaccinated dogs that are good with pups, then get your pup round there to learn a few manners.
I'm not saying get your pup out there on a lead and walk it, but do get your pup out with you, in the car if necessary, and get it used to all sorts going on around it. If your pup is apprehensive, just let it view these things at a distance, don't shove everything in it's face at once, but do let him/her see these things, so that they are just part of normal everyday life.