Mate what is your current profession?
1. First of all you need certificates duely attested by Indian embassy as well as Qatar embassy.
2. Your last six month salary should be received by you from your employer in salary account in back. That statement attested.
3. Your salary certificate and contact Copy.
Then hand over this to your pro hewill do it for you.
Our just go to any attestation center to get it b done.

Hope it will help you.

Enjoy.

Ashwin