Organization will hire an ISO consultant. Consultant will consult them on how to implement ISO 9001 into their organization based on ISO 9001 requirements.
When whole system is developed, organization would need to conduct an internal audit before the certification body come for ISO 9001 certificate audit.
After that, management will need to review the internal audit result. If it’s ready, they can arrange certification body to come for audit.
Certification body will prepare an audit report after audit. If no non-conformance being identified, certification body will proceed for certification approval.