Hello,

For those who are starting to work on O365 using powershell, here below are some short lines to help you.

Prerequisites :

https://technet.microsoft.com/en-us/library/dn975125.aspx

Connect to O365 :

$cred=get-credential -Message "Please provide an O365 admin account"
connect-msolservice -credential $cred
$O365Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $cred -Authentication Basic -AllowRedirection
Import-PSSession $O365Session -AllowClobber

Add a licence to a user :

$Options = New-MsolLicenseOptions –AccountSkuId "YOURTENANT:ENTERPRISEPACK"
 Set-MsolUserLicense –UserPrincipalName $upn –LicenseOptions $Options -ErrorVariable:errv