Seeking relocation/Package/Cost of living advice

Dear Colleagues, I am finalising an offer to move to Saudi Arabia in January. Please can i have your valuable input on some of my questions below
1) I am a qualified auditor  and have over 14 years Management experience in the Oil and Gas Sector and would like to hear from colleagues in the industry if the salary range is around SR36,000 to SR50,000/month? What would be the ideal market related range for the sector?
2) I have researched on cost of living on the web and for a family of 5 i get ranges of SR 6,000 to 12,000. Would an average of say SR10,000 be somewhat ball park?
3) Also if someone can advise me of what the private schools rates are roughly. (ages 6 and 2 (twins)

Thanking you in advance for your advice.