Documents required for OCI - Become British recent

Could you please lets know what documents are needed for OCI ? I am indian. recent become British citizen.me , wife and kids hold indian passports , we are all applying together.
I don't have birth certificates and my parents passports but my Indian passport has all information like date of birth, place of birth.
Hope my Indian passports are enough evidence to satisfy our indian origin proof or birth certificates.Also i will be submitting the surrender certificte.

Do go through this site

http://www.hcilondon.in/ocipci.php

thank you , my question is regarding point "(v) Indian Origin Proof" from the website.http://www.hcilondon.in/oci.php

Looking for any Indian citizen who has become ILR -> citizen and has applied OCI recent , please advise.

I pressume Indian Passport could answer all but wondering whether i still need to submit birth certifcate,marraige certificates.

Your surrender certificate is enough as Indian Origin Proof for your and your kid(s) OCI application.