Imap to office 365 email migration

I am looking to migrate our existing IMAP and Gmail email to Office 365. The project is for an existing business and we have existing Microsoft 365 licenses. We need to migrate the emails of 17 users. We are looking for someone experienced in setting up and migrating to Office 365 who can ensure that the whole process is smooth and secure. The successful freelancer will be expected to guide us through the process and provide training where necessary.

all users have been created in office 365. list of both side username and password will be provided.