You can become a host by uploading some pictures of your house/room for rent on here;
I’ve been hosting for a year (since August 2015) and although the internet has a plethora of videos of different experiences, mine is unique to running Airbnb in Ontario. If you want more information from my experience and the ups and downs of hosting, please fill out the contact form and I would love to meet for coffee and answer personal questions face-to-face!