The package that they gave you is already good excluding accomodation (rental is something that is expensive in qatar). if you are coming with your family, you can only save a little or non at all since education here is also quite expensive (unless, this is provided by your company). If your coming as a bachelor, saving monies will all be up to how you will live your life here in Qatar. if you are not that extravagant person then, you can save more than 5K.