Dogs:Parvo question??

I live in on post housing and I know that the previous owner had dogs. We just got a 7 week old puppy and I am taking him in tomorrow to get all of his shots and the parvo vaccine, but i know that the vaccine isn't the only thing to protect him. What can i do to my yard and my house to make sure that he doesn't get it? What are some other precauitions that i should take in order to make sure nothing happens to him. should i just not let him be anywhere but my backyard or in my house pretty much and the vet when I take him? Ive never had a dog die from parvo but i dont want to risk loosing my puppy to this at all so i want to get all the advice I can to make sure that he doesnt get it.