Depending on the location and the type of apartment you choose, this amount can range between CHF 18,000 & CHF 30,000
This will include accommodation, food, health insurance, transport, and other things
You can read more here
The residence fee includes your room fee, meal plan, parking, transport, and residence council fee.
Depending on the type of plan, these can cost anything between $12,801 and $15,906.
You can read about the details here.
Usually, you should fly 1 to 2 weeks before the college starts.
But the date at which you can arrive on foreign soil will be mentioned in your I20/Visa documents.
If not, you can email the recruitment officer to find out.