As you have a management system in place, but are not sure how compliant it is to ISO 27001, there are services available to you prior to your initial certification audit.

A Gap Analysis will benchmark your processes against the standard and identify areas for improvement before starting the certification process. The purpose of this analysis is to identify areas of non-conformance and allow you to correct these before you begin the certification process. 

The training needs of your team members should also be evaluated. Your team members are responsible for implementing and maintaining the management system.