So:
1-The salary has to be at ranging between 18 and 20 thousands riyals.
2-Accommodation allowance at least 10 thousands riyals.
3-Annual leave ticket for yourself and your family has to be included in the package.
4-Car allowance at least 2000 riyals, so you could be able in the future to buy a car, because transportation is very important in Qatar, unlike UK.
5-School expenses are sometimes paid by the company, it all depends on the company. If it's something like QP, Ras Gas and so on, they pay the school expenses; otherwise they don't.
6-Electricity/Water is paid by yourself, so you will need to make sure to deduct that from your salary.
7-Air Fares discounts are also included (depending on the company's deal with the ailrine)
8-Qatar isn't cheap, that's why you need this kind of salary, and maybe even more.

Anyways good luck in your search, I am sure you will find a better company to hire you.
You got experience and you're an IT Manager.

Cheers!