Rent 2 bedroom = 7500 to 12000 (depends on area)

1 Bedroom=4500 to 7000

groceries depends on ur life style. you can manage with 2000 to 3000

2000 model vehicle will cost you. 15000 to 20000.

i hope you got some idea now

& welcome to doha..apart from cost of living.......its a far better place than  KSA