Basically, as I see there is a mixture between ISO audit and internal audit which is conducted by IIA Standards.
For now, there is no QMS system in my company, neither any of the ISO standards is implemented. At the moment , I am planning to conduct an audit following IIA standards, based on risk assessment of each audit unit in the company, and to make a 3 year strategic plan.
As well, today I contacted ISO professionals so we can start implementation of ISO 9001:2015.