For 7K yoc can lead a family life in Qatar, But you can take the visiting visa for wife ,for permanent you need to get job for your wife, here we can get 3000Qr good house, and for Expences 1000Qrs and for Petrol and mobile you need 1000Qrs, so 5000Qrs is enough to lead a life in Qatar,
But ask your company to give Car, and House allowance,
by All the Best