Qr. 15000 is good enough for a bachelor of your type. If you are planning to share your accommodation with other Indians (bed space only) it will cost you approximately Qr. 500 to 750 per month and if you are planning to get an executive bachelor accommodation it will cost you between Qr. 2000 and Qr. 2500/- plus the furnishing expenses which is one time only. Are you planning to have food from restaurants or you will be cooking at home. If you are planning to eat from good vegetarian restaurants it will cost you like Qr. 800 per month and if you are planning to have food from the normal restaurants it will cost you approx. Qr. 500. If you are sharing your accommodation most of the bachelors are preparing their food at home and it will not cost you more than Qr. 300/- per month. Taxis are bit expensive but buses are very cheap here. Cost of mobile connection is a one time issue but the call charges will depend on your usage. Then you will have other expenses for entertainments and health which will not be that much. You can still save a lot of money.