Normally following documentation is required for permanent family visa.
1- your attested degree certificate.
2- Attested marriage contract with Arabic translation from a legal translator.
3- your salary certificate NOC from your sponsor.
4- Rental contract from yourself or your relative with which you share accommodation.
5- An application duly filled from a typing office outside the visa office or from your HR department if they can do it.
the above attestations should be from the MOFA of your home country plus Qatar embassy in your home country and MOFA in Qatar.
And your luck