You’re looking to set up an international Office 365 environment, and cannot find anything about it? That’s correct, because there is nothing like that at all. Neither a guide with best practices.
Some people suggest to set up a tenant on each continent. Give this a thought for a minute, and you can come up with even more questions.
- You can only use your domainname on one tenant, how to handle the other tenants?
- What to do with multiple SharePoint Online, OneDrive for Business and Yammer tenants, thinking in terms of replicating data?
From my point of view, setting up only one tenant is just fine. The only thing you might take in mind is setting one up on the continent on which the biggest part of your users reside.