Video Conferencing Tools - Skype
Overview of How to use Skype Meetings
Getting Started with Skype - Get an Account and Join a Meeting
Getting Started with Skype - Running Your Meeting
Breakout rooms in Skype are not available - as a workaround, you can create separate group chats.
Skype Whiteboard is free for 'Skype Business' subscribers. If you want to use a free whiteboard, the best option is to use secondary software that is used by participants outside the Skype meeting and then shared from your desktop.