Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
You would probably want to engage a Microsoft education partner in your country with this project.
It is not merely moving data from one platform to another, but it is also teaching your academics and administrators this new platform, to both use it, and to teach with it. This platform can be quite different from what they are used to.
What to move depends on what data you have on Google as well.
As the education SKUs of both Google and Microsoft are slightly different from their main stream commercial slanted counterparts, having an experienced partner may ease the pain of migration, but I am not sure how many are experienced in both Google Education and Microsoft Education.
Do contact your local Microsoft in country office to get some recommendations of Microsoft education partners.
Cheers