Go online and order a copy of Gwen Bailey's "The Perfect Puppy". It tells you pretty much everything you need to know.
Learn the signs when he/she needs to wee/poo (sniffing, circling etc) and the times he/she tends to go (on waking and after eating are pretty much dead certs, and they often need to go when they've been playing). Take the puppy out to the garden at these signs and times, and every time it wees/poos outside, give it loads of praise and fuss, and a treat if you happen to have one to hand (pockets full of dog treats are also a good move - you can reinforce every bit of positive behaviour that way). I housetrained my last puppy in 3 days this way.
Be rigid about toys left around on the floor, especially things like Lego that have little bits. Like babies, puppies put everything in their mouths and they choke really easily.
Never tell the puppy off for chewing something it shouldn't. Tell off the person who left it where the puppy can get it, it's their fault.
Yes to a crate, for the kitchen and for the car. The first will give the puppy a safe space to retreat to and the latter is essential for safety.
Your biggest problem is going to be socialisation. A vet told me that by the time a dog is 16 weeks old, it should ideally have encountered everything it's likely to come across. During lockdown, that's going to be tricky.
I took all mine on trains, buses, walked busy roads, went to farmers' markets and boot fairs where they would meet children and other dogs, went to my friend's stables so they could get used to horses*, went for walks that took us through farmyards so they got used to cattle, sheep etc and took them out in boats, even if it's only a boating lake in the park.
Puppies nip. Don't tell it off when it does this, but make a whimpering noise, like a hurt puppy would. It'll soon learn not to. Make sure the rest of the family do the same.
And when the puppy is tired, don't let the children or anyone disturb it.
*My dogs have been complimented for their steadiness around horses by the master of the hunt, a mounted police sergeant and the lads who train the racehorses at the yard just up the hill. You may not come across horses often, but a dog who barks at or runs around them is an absolute menace and can be very dangerous.