May be very soon in Qatar

Dear All,
I'm a french project manager in energy business and currently working for a french wellknown company in france. My boss just proposed me to move to Qatar to develop the business and also take care of project management tasks. If all administrative issues are cleared i should fly to Qatar (Doha) with my wife and kid by the end of this year. I have few questions and would be grateful if french expat could reply to me.

1) On a monthly basis, how much is a primary school fee ?
2) How much is a car (normal family car) leasing?
3) How much are monthly expenses such as:
   Renting a 3 bedrooms flat:
   Utilities (Electricity/Gas/Telecom + broadband internet):
   Food shopping for 3:
   Housing Insurance:
   Restaurants (approx once a week):
   Some outings (cinema, theater, etc):
   etc.

Just for your info, it should be a local contract and i would like to make sure my family does not suffer from leaving france... .

How much should i ask my employee as minimum salary?

Thanks
regards