Addressing internal and external issues

Determined issues whether internal or external do not necessarily require taking actions to address them. Basically, the information about the context is input for planning your Environmental Management System.

Also for internal and external issues, is it enough to that I rated each of them based on severity and occurrence, made an action plan for each item, and significance. Is that enough?

Internal and external issues are not environmental aspects and they do not require evaluation and taking actions like for environmental aspects. All the organization needs to do is to define context of the organization and all further steps in implementation of the standard will be affected by the context of the organization.

For more information, see: Determining the context of the organization in ISO 14001 https://advisera.com/14001academy/knowledgebase/determining-the-context-of-the-organization-in-iso-14001/