Considering that, to implement ISO 27001, broadly speaking, after getting support for your project (through approval of the ISMS project plan) and approval of the Procedure for Document and Record Control, you should consider these steps:
defining ISMS basic framework (e.g., scope, objectives, organizational structure), by understanding the organizational context and requirements of interested parties;
development of risk assessment and treatment methodology;
perform a risk assessment and define the risk treatment plan;
controls implementation (e.g., policies and procedures documentation, acquisitions, etc.);
people training and awareness;
performance monitoring and measurement;
perform an internal audit;
perform management critical review; and
address nonconformities, corrective actions, and opportunities for improvement.
Compliance verification is performed by means of an internal audit. For the preparation for an internal audit you should consider these general steps:
identification of the audit scope (is it the whole scope or only part of it?)
review of the ISMS documents related to the audit scope (e.g., policies, procedures, and records), considering the main clauses from the standard (from sections 4 to 10), and controls from Annex A stated as applicable in your Statement of Applicability (SoA).
review the status of the actions related to the decisions made in the last management review.
review the status of the raised nonconformities and opportunities for improvement.
These articles will provide you a further explanation about internal audit: