well, the main expenditure in qatar would be your accomodation which is allready taken care of, its allways advisable to buy a brand new car and if u r looking at Honda CRV , you would be paying up an EMI of about 1500 QR per month for about 5 yrs. other living expenses depends upon your life style, there is a good nite life in Doha, am sure you would enjoy it here in qatar. Good luck.