Microsoft Tech Community has published a short list of videos to help you make your change over to Office 365 admin center just a little bit easier. As it says in the description, you’ll learn how to set up and manage Office 365. Videos include : Admin overview, Set up a domain, Manage people, Get software, Get email /calender and contacts, Manage documents,Chats and Meetings,Billing and subscription.
More videos are expected to be added as time goes on.Check out here