Create Remote Mailbox in O365 when creating a user

Create Remote Mailbox in O365 when creating a user

I've looked through the documentation but I guess I'm missing the process for creating an Office 365 mailbox for a user in a Hybrid environment.  I don't know how to fill out the Exchange mailbox information and the Remote Mailbox information, or what.  Can someone point me to an example somewhere?  To be honest, the help docs seem a bit lacking in this area.