Well... what will be your post over here in Doha, Qatar?
A manager post can get upto QR. 20,000 - 25,000/Month, even more with other allowances.

Ask for family accomodation coz, a two bed room flat may cost something between QR. 7,000 - 12,000/Month depending upon the location.

Petrol is cheap here in The State of Qatar.
Food may cost you an average of 3,500 - 5,000/Month if you are staying with your family. Depends on the way you spend.

Ask for Insurance Coverage, Medical Coverage, Car & Petrol Allowances.

Welcome to Qatar and Gud luck ....