You should have at least 7-10 videos already online and more content ready to publish. There are a lot of tutorials on youtube and blogs which explain it in detail. The hardest part for most regarding them is, that there are so many to try it to make money. You have to believe what you do gives value to everyone else and that should be your main focus.  If you follow this idea, chances are a lot higher to get a big audience at some point.

You can promote on steemit, twitter, medium, facebook every social medium will be your friend.