Assuming you will be ok with a 2 b/r flat fully furnished, you will pay approx. QR 8 000 to QR 10 000 (or thereabouts).

Take another QR 2 500 for a reasonable car and about QR 3 500 for groceries, utilities etc. Also allow about QR 3 000 for sundries.

That leaves about QR 16 000 or so. You can probably save at least QR 14 000 and still have a cushion of QR 2 000 for unforeseen expenses/luxuries.

This has been my experience over the last 18 months

*** Light travels faster than sound. That's why most people appear bright until they open their mouths.