Even I'm googling for the same information, I would like to share my knowledge with you but it may be not fully correct. Suggest you to cross check with other people out there.

Family visa
Degree certificate attested, Marriage certificate and birth certificate attested, NOC from Company
4. Salary certificate 5. 6 months bank statement
6. Rent agreement on your name. salary should be 10K QR or 7500 QR with family accommodation and other benefits from company. Your position should be engineer or manager in you RP.