All documents as listed by Raja must be attested by the Ministry of Foreign Affairs of the respective State. After attestation from the State, it must be attested by the Ministry of External Affairs at Delhi followed by attestation by Qatar Embassy at Delhi.
After completing the attestation in India you can enter Qatar. Before applying for RP these certificates must be attested by the Qatar Embassy in Doha for family visa.
The process is very simple but it requires a lot of running around.