1&2. Salary depends on nationality and the hospital/private company that you work for.

3. Most people who work here the company they work for decides the price they are gonna pay for housing, ergo depends the size of house. Usually it's the husbands company that pay...it's a paternalistic society.

4. Depends on the company, position you get and the company.

5. You have to have a Qatari partner to start a business.
They will take half if not more, but you will still make a profit if it is a good, unique, in demand business.