I will be straight for you too. I have not launch any product yet, but I have been in online world since 2011. To launch a product is not that easy, you will need a landing page, squeeze page and a traffic to that page.. also an auto-responder to capture emails.
But with your TEFL course, you need a website. In building a website, this I can guarantee you and with the landing page and video creation for your promotional.
Of course, we need more traffic for your product, we can advertise through FB or PPC and Twitter.