Look man, you have got enough money to save and can keep your wife here in qatar. i don't know y people are creating disinterest in you !!! instead of giving you encouragement.
It is fair enough in Qr. 12000/- to live here and save money for yourself. There are plenty of workers here are not getting a sum Qr. 20000/- per month to live in Qatar rather I would say they hardly receive Qr. 5000/- P/M. So you imagine how they manage to live their lives, if they can y can't you.

It is totally depend upon you how do you live, what's your living standard, how you can save....etc..etc...it is totally depend on you only. Don't ask for suggestions unnecessary for all these kind of things. There are many to advice you for nothing. So, give yourself a try see what if you can do to yourself.
Don't simply give up by getting some stupidful suggestions. And always remember this: Asking for so many suggestions,Make a person confuse and does not let to decide anything.

So, always give a try, and quit if you feel to quit....

Best of luck...
Give yourself a try first.
Bye