You need to be attested in all your documents in your country first.
Needed documents:
1) marriage certificate(EVEN THOUGH, NAMES ALREADY MENTIONED BOTH PASSPORTS)
2) birth certificate for all children (EVEN THOUGH, YOUR NAMES ALREADY MENTIONED IN THE CERTIFICATE)
3) degree certificate
ATTESTATION IN YOUR COUNTRY:
1) All certificates should be attestation from THE NOTARY REGISTERED LAYERS AND JUDGES in your country
2) All certificates should be attestation from THE MINISTRY OF FOREIGN AFFAIRS in your country
3) All certificates should be attestation from THE EMBASSY OF QATAR in your country

IN QATAR,
1) All certificates should be attestation from THE EMBASSY OF YOUR COUNTRY in QATAR.
2) All certificates should be attestation from QATAR MINISTRY OF FOREIGN AFFAIRS.
ALL THE BEST.
DO DUA TO THE ALMIGHTY