Firstly, maintenance loans wise www.savethestudent.org/student-finance/maintenance-loans.html tells you what they can borrow based on your household income.
The other thing about cooking is how to store left overs and how long it will last for. Understanding that you will probably only have 1 shelf in the fridge and it may not be 60cm wide.
I think a lot of uni launderettes are Circuit Laundry systems, Ds was given a card when he arrived at uni, you top it up online, then they take their card to the machine on the wall in the laundry room, it transfers over the credit. Most machines are QR codes so you scan it using the app on your phone. At Durham tumble drying is free thank goodness, a load of washing costs £3.50. The machine can only take a weeks worth of clothes so Ds spends £7 a week as he washes his bedding and towels in one machine, clothes in another.
His room key is a key card too. Make sure they have a wallet with enough slots in for everything. Ds has 2 bank accounts, the student one which you can only open after results day as you need a code from the uni and also an everyday Monzo account. The student account has his maintenance loan paid in and his accommodation direct debit goes out of that. If he were to lose one card he would still have access to money.
Buy some vacuum bags to pack duvets/blankets/pillows just so you have more room in your car unless you have a massive estate car. It is amazing how much stuff they take.
Watch the videos on YouTube of students moving in, especially into the uni your son will be attending and also the a day in the life which Ds used to get a feel of how far the accommodation was to the campus buildings.
Register with the GP at the uni. They are used to having thousands join every year as well as leave after 3 years. Ds will be at uni for 30 weeks of the year. For Durham it was online. Dentist we kept here as we can book him in for when he is home.
Get him to do a meal plan and a supermarket shop to see how much it will cost him. Ds was very keen on condiments to zhuzh up dishes so we sent him with a whole bunch when we set up his store cupboard food.