the offer is reasonable for qatar giving that the car is provided and accomodation is provided. yet this is a single man offer.
if you can assure that grade 11 can have family status, that will be good as accordingly the accomodation shall change to family accomodation.
yet, MAKE SURE THAT GRADE 11 CAN HAVE FAMILY STATUS. grades might be similar in number between companines, but not same policies applies.

the offer as starting offer will allow you to live reasonable life with weekends fun, you and your wife. do not expect to make a life shift in the first year.

we all may have a bite from offers, that's why we might be very critic in giving advices.
main concept to accept offers are
* accomodation provided or reasonably given an allwance
* car provided or reasonably given an allwance.
* 3000 can be reasonable life expense for an individual, for 2 might go to 5000

good luck with your life and gongrats for marriage