Start up both Outlook and Skype for Business on your Mac and be sure you are connected on both applications. On Outlook, select the Calendar icon.
Right click and select New Meeting
Select Skype Meeting
Fill in invitees and Subject and set desired Time
To Join Meeting, open Meeting Invite
You can also join through the Skype for Business Application by selecting the Meeting icon and then the desired meeting and Join
Select Audio and Video Options and Join