living with family is expensive when you are the only working person.
You definitely need a 2 bhk - starts around 5.5k to 7k depends on the area.
you definitely need to get your own car here- if you plan to stay long term.(getting a DL in qatar is costly and time consuming)(car pooling is also expensive).
School admissions are very difficult. try finding a contact well before hand.
You will need approx 12k to 15k every month(very modest life style)

FYI - you can apply for a family visa only after 6 months of you being in qatar(6 months bank statement required). So plan accordingly.
Drop in a msg if u need more info.