Information about Office Training is available in this article: Microsoft Office Training
You can create a Contact List in Office 365 for your personal use. This list can contain internal & External users and will only be accessable by you.
Login to Office 365 by going to Login.williamjames.edu and selecting Office 365
Click on the Grid in the top left corner of the screen and select People
Click the drop down arrow by New and select Contact List
You can now create a contact list, name it and assign members in the below screen.
When you add members you will not see their names only that new members were added. After you save the list you can view the members by clicking on the group in your contact list.