1. Install Office
To install the Office apps, go to the admin center at https://admin.microsoft.com.
To start the wizard, select Go to setup.
Under Install your Office apps, select Get started.
Under Microsoft Office Professional Plus, select Install now.
Choose your language, and then Install.
More at Install Office.
2. Set up Outlook for email
On the Windows Start menu, search for Outlook, and select it.
(If you're using a Mac, open Outlook from the toolbar or locate it using the Finder.)
If you've just installed Outlook, on the Welcome page, select Next.
Choose File > Info > Add Account.
Enter your Office 365 email address and select Connect.
More at Set up Outlook for email.
3. Add users (for admin only)
go to this article
4. Learn more about the Admin Center here