For family visa you need to attest your educational certificate, marriage certificate and birth certificate of kids.6 months bank statement is required, rental agreement required,for bringing family for 6 months ur salary should be above 5000 and for getting permanent family visa , ur salary should be above 11000.

i did my attestation from Asian Attestation Services, they gave me gud service, for details u can check their website:
www.asianattestation.com