Implementation approaches

Answer:

To start the implementation of an ISMS complaint with ISO 27001, you should consider these steps:
1) getting management buy-in for the project;
2) defining ISMS basic framework (e.g., scope, objectives, organizational structure), by understanding organizational context and requirements of interested parties;
3) development of risk assessment and treatment methodology;
4) perform risk assessment and define risk tent plan;
5) controls implementation (e.g., policies and procedures documentation, acquisitions, etc.);
6) people training and awareness;
7) controls operation;
8 performance monitoring and measurement;
9) perform internal audit;
10) perform management critical review; and
11) address nonconformities, corrective actions and opportunities for improvement.

This article will provide you further explanation about ISMS implementation:

- ISO 27001 implementation checklist https://advisera.com/27001academy/knowledgebase/iso-27001-implementation-checklist/

Regarding implementation approaches, the most common are:
- Use you own staff to implement the ISMS
- Use a consultant to perform most of the effort to implement the ISMS
- Use a consultant only to support the staff on specific issues, leaving the organization's staff with most of the implementation effort.

Each one of them have their advantages and disadvantages. For more information, I suggest you the following materials:
- 3 strategic options to implement any ISO https://advisera.com/blog/2016/04/11/3-strategic-options-to-implement-any-iso-standard/
- Implementing ISO 27001 with a consultant vs. DIY approach https://info.advisera.com/27001academy/free-download/implementing-iso-27001-with-a-consultant-vs-diy-approach
These materials will also help you regarding ISO 27001 implementation:
- Book Secure & Simple: A Small-Business Guide to Implementing ISO 27001 On Your Own https://advisera.com/books/secure-and-simple-a-small-business-guide-to-implementing-iso-27001-on-your-own/
- Free online training ISO 27001 Foundations Course https://advisera.com/training/iso-27001-foundations-course/
- Diagram of ISO 27001:2013 Implementation https://info.advisera.com/27001academy/free-download/diagram-of-iso-27001-implementation-process
- ISO 27001 Documentation Toolokit https://advisera.com/27001academy/iso-27001-documentation-toolkit/