Hopefully they wrote down what he needs to take because we can't predict amounts here.
Normally the long acting background is taken once daily - either morning or night (before bed is quite common).
The fast acting is a combination of how much he's eating that meal and a correction dose (if he's high before the meal). You typically have it 3 times a day, once before each meal.
They'll probably start him on a low dose and gradually increase it to get his blood sugars down.
If the background insulin is correct, he won't need to eat for it.
If he's a new T1, his body may well go through a honeymoon phase, where it produces some insulin, so blood sugars can be unpredictable. They should give him a meter so he can test them.
As a T1, my partner does not help me with calculating insulin or guessing the carbohydrate in food, but he has helped me many times with hypos.
Hypos happen when your blood sugar is too low (too much insulin in your body). Your brain is short on sugar and becomes confused - you could potentially even go into a coma. (Though this is very rare and they'll be starting him on low doses of insulin rather than too high). Keep sugar readily available (glucose tablets are good but some people prefer things like jelly babies) so that you can give them to your partner if he is too confused to eat (eg at night).
http://hypoglycemia.uk/#/
Having said that, I suspect his blood sugars will remain quite high for the first few weeks, so hypos won't be an issue for a long while.
