Dear Sanjeev,
There are many authorized certification bodies like BVQI and DNV. You have to seek their help in getting your organization certified. Before going in for certification, you have to frame organizational objectives and department objectives, and also the department procedures which you would like to follow to achieve the department objectives.
Based on your requirements and ease of operations, you can prepare procedures for different departments. The main aim is that all employees speak the same language, and every single employee is aware of their department procedures.
Once this is in place, a Management Representative should be appointed. They will verify whether the procedures are being followed by the organization by conducting Internal Audits through internal auditors (You have to identify employees and give them training on Internal audit).
Then the certification body will initially check the procedures in relation to the operation and give their recommendation. This is called the certification audit, and from there on, every year they will do periodic audits on the effectiveness of the system.
Hope it is clear to you. If you require any additional information, please let me know.
Regards,
Suresh