Depends on your pay & social life here..
Apartment Current rate :
Studio of high caliber in prominent areas around QAR 9000/-
Other- starts from at least QAR 3000/-

Transport- you can own a car for like starting QAR-30,000 with monthly instalment base,again it depends on what u want to drive

Gas -is cheap here

Electricity bills are not too much-Depends on usage

Gym- minimum annual fee u can get for QAR 5000/-

Again ...It all depends on your personality & where u come from...same as the first comment on this thread.

Good luck!!