Congrats for the interview.
As people said, you have to negotiate the following:
- Housing Allowance: A apartment in a good area could cost minimum 14,000 QAR and a villa in a compound between 18,000 up to 25,000 QAR.
- Transport Allowance: If you want to buy a car you have to pay between 1800-2000 qar month to the bank.
- Salary minimum between 18,000 - 20,000 QAR
- Education Allowance: Minimum 30,000 qar per child
- Travel Allowance: Or al least 1 ticket per year to go back to your point of origin.
- Medical Insurance
- Life Insurance

Hope this info will help you.