First thing is you are not eligible to get family visa (rp for wife and kid) if your monthly salary is less than 10000 QAR. The food expenses here in qatar are affordable and depends on ur preferences. main cost consuming is the rents. If you opt for a 1BHK, u ll get it for about 3 to 4k QAR. 2BHK will caost u around 4.5 to 6K (max 20k/month)depends on location. negotiate for 12k atleast so as to survive comfortly.