Hello rahat,

At first, I don't think you will be able to get family visa since the Labor Department requires a regular income which is above 7.000 QRs (they might have increased this figure) per month.

Secondly, it is difficult to estimate the cost of living in your case. But i can definitelly say that you might be facing with difficulties if you do not have additional income beside your salary.

For cost figures, you can search QL site, and you will find many posts related to the cost of living in Qatar.

All the best