Before building your online training product you might want to consider simply trying to sell your product. If you can't sell it to at least one business (if a B2B) or to 10 consumers (if a B2C) then you won't be able to sell it to thousands. I'm in the business of helping validate ideas and selling is the best measure. Best of luck and if I can be of help, please connect via my site http://TryHypothesis.com