First let me say how sorry I am to hear this and I hope your boy has a speedy recovery.
It is so hard to find more than just vague information on the parvo virus since every website out there seems to just repeat the same exact info almost word for word. My pup was diagnosed with parvo two days after we brought her home and she passed away a week later due to, what we believe, a secondary infection. It was devastating. Luckily with prompt treatment the majority of parvo cases aren't fatal.
Depending on the severity of the symptoms of your pup, and your comfort level with treating him at home, I would either look for an urgent care vet that can provide 24 hour care or ask your vet about home treatment. The biggest threat is dehydration, which can happen VERY quickly in puppies when they are vomiting and having diarrhea. There are ways to treat parvo at home that you can ask your vet about but I didn't feel comfortable with it and so we chose the urgent care vet.
As far as disinfecting goes... Bleach is your new best friend. Bleach all the hard surfaces your pup came into contact with and do similar things with clothes, carpets, and furniture. This can be difficult because bleach ruins colors and stuff, so we ended up just cleaning with normal stuff what we couldn't do with bleach, even though that probably won't kill the virus. In the yard I poured bleach directly on the spots that she went potty, which killed the grass in that spot and remained dead for about a year afterwards, but I'm not much for looks and I hated the idea that there were spots where the virus would remain for 12 or so months. Throw out all the soft toys that were exposed to your pup and bleach all the hard ones. If you decide to bring your pup home, keep him isolated in an area that is easily bleached and don't let him out anywhere else.
How old is your other dog and is it vaccinated? If it's and adult and vaccinated, there shouldn't be much worry unless it is an elder dog. Most adults that are infected show mild symptoms and aren't at much risk of death.
Here's hoping for a quick recovery!