If you get the Accomodation Allowance or Comnpany Provided accomodation and the medical coverage ,then even 8000 Qatari Riyal is also ok but 10000 Qatari Riyal will be fair enough for a person with 04 years experience only.It also depends on your family size like for a small family with a kid or no kid even you can survive in One bedroom + 01 Sitting room also which may be aorund 4000 Qatari Riyals fully furnished but for a bigger family it will be very difficult for you to stay on your own as you will need to get a bigger house.
Arranging the family visa is not a big problem as long as you have salary more than 7000 Qatari Riyals.Best of Luck