The first step is to set the parameters of the audit, including:
what you’ll evaluate, e.g. websites, apps, etc.
which privacy laws and requirements you’ll check against
who will conduct the audit
how frequently you’ll conduct audits
Once you have your methodologies in place, examine your data inventory, processes, and privacy policy. Evaluate these to see if they comply with current relevant regulatory requirements, and check that any vendors you share data with are also compliant. Remember that the data controller is responsible for the privacy compliance of their data processors under many data privacy laws. Document any places where security and data handling are not compliant or can be strengthened, and create a report with recommendations for changes to enable compliance.