Creating-Policy

Hello.

Creating an IAM policy itself can be done by following the steps in the document below.
https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_create-console.html

To identify the actions required to actually create or operate AWS resources, you can use methods such as resolving permission errors one by one while actually performing the operations, or using an "IAM policy simulator".
https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_testing-policies.html