You can find 1BHK semi furnished brand new flats including water and electricity in Doha at Qrs 3500-4000 per month. Grocery, 1000- 1500 Qrs. Petrol and other maintenances, 300-500 if you have an economy car in good condition. Telephone and internet, 250-500. So total monthly expense will come around 6500 - 7000 maximum. You can save half of your salary if you have a good plan. Good luck go ahead this is a good job offer if the company and project is real.