Hi
do kids normally take in morning snack?
Yes they do - there's a long break halfway through the school 'day' for them to have their snack. There will also be vending machines.
Do they both start each day at 8?
What time do they finish school? Do both boys finish at same time?
You should be given a timetable for your boys - how old are they? For older children, they probably do start at 8 every day.
Do they need specific things for Turnen? Do they take Turnen stuff in on the day they have Turnen, or just leave it at the school?
This may depend on the school - some provide lockers which you can probably rent for a small fee. They'll need sportswear, plus gym shoes.
Do they need Hausschuhe?
Again this may depend on the school but I would expect not.
What other equipment do they need for school?
They'll have to borrow or buy their books, and they'll probably need Schulhefte for each subject, possibly with coloured wrappings (do they still do those nowadays?). Again the school should provide you with a list of things to buy.
Hope this helps - if you need anything translated into German, just ask.