How to do environmental training with your puppy
Remember that your puppy should never be forced into an encounter or into an environment, if you do it will have the opposite effect and produce bad memories that often stick very hard and are difficult to train away. Instead, make sure the puppy has a choice to walk away if it needs to and start with easy environments and then work your way closer to what seems to be hard for your puppy.
Adapt the training to what your puppy is already used to and comfortable with: a puppy living in the countryside may find being in the centre/city hard work, while a puppy living in the city may find the countryside/woods worryingly quiet.
Feel free to take your puppy into various dog-friendly shops and let it smell all the fun stuff. Go to the vet and let it eat some treats in the waiting room, maybe say hello to the receptionist or some nurse, maybe they'll even take a quick look at the puppy's teeth and you'll then reward them. It will make it easier for the dog when it needs veterinary care later.