ISO publishes four standards that focus directly on an organisation’s QMS:
The management system standard: ISO 9001:2015. This standard is the specification for a QMS.
The Technical Standard ISO/NP TS 9002:2016 Quality management system — Guidelines for applying ISO 9001:2015. This standard provides extensive knowledge on all aspects of a QMS and has copious examples from which you can draw.  Note: This is not a Normative Reference in ISO 9001:2015; therefore, applying it to your QMS is not mandatory.