Welcome!!! Yay another newf puppy!!! I'm Erin and I'm the humble servant of Kali the newf and Lacey the aussie.
Must haves with a newf puppy:
1. a kiddy pool or sprinkler or other form of water to play in.
2. A swiffer vac perfect for getting all the hair in between major cleans.
3. For teething (I know it will be a little while) Chilly Bones are awesome you dunk them in water and throw them in a freezer and they soothe the sore gums.
4. Kongs are awesome to keep them busy as well as for teething.
5. Some sort of no chew spray to protect the stuff like woodwork during the chewing phase.
6. A non flip water bowl that isn't big enough to play in unless you don't mind having water all over the floor
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As for the potty training it is possible to be trained that early just be ready for accidents. Generally you'll want to take them out about 10 min after a major drink and 25 min after eating. I've heard teaching them a cue to go potty works wonders but haven't had the chance to try it with my dogs. Also make sure you puppy proof very well so he can't get into everything. Don't let him jump around by lifting him in and out of cars (also you may want to get a ramp and train him to use it) and up and down stairs until he gets too big. Good luck with your new puppy and I hope you post lots of picks of all of your furkids.