Answers:
1. Health facilities in Qatar are very good and once you get resident permanent (ID card) you will be able to obtain a health car for only QR 100 (family aswell)

2. Qatar is tax free as far as I know.

3. Flats (two bedrooms) in Airport area would be between Qr 4,500 to Qr 9,000 monthly

4. Lots of Indian families and other nationalies as well.