Kadir,

You need to have the following documents for applying your family visa.

1. Copies of your passport & ID & RP Page
2. Copies of your family passport & Children passport
3. Birth Certificate copy of children(duly attested by your Embassy & Ministry of Foreign Affairs)
4. Marriage Certificate copy(Duly attested by your Embassy & Ministry of foreign affairs)
5. A letter from your sponsor
6. Bank Statement atleast for three months
7. Electricity/Telephone bill/Rental Agreement copy

You have to submit the application alongwith above documents to labor department for approval, once it is approved you can collect visa from Immigration department by paying the necessary charges.

The minimum salary limit for family visa is QAR.7500/-.

Rest of the things you can followup with your Company PRO.

All the best!