Kindly guide me the preparation process for the certification
Answer: Considering your background, I'd suggest you to go for the ISO 27001 Lead Auditor certification. This certification recognizes people who have competency on auditing an ISMS against ISO 27001 requirements and qualifies them to start the process to become a certification auditor.
The first step for ISO 27001 Lead Auditor certification is to attend the ISO 27001 Lead Auditor course, which will present you the general concepts of the ISO 27001 standard and the audit methodologies and techniques of ISO 19011 standard. It is a 5 days course, after which you will take the exam.