Lets get you up and running as quick as possible. One course, with payment and landing page to sell the course as quick as possible. Once we have one working, then we can go back and start adding courses, and perfecting the sales funnel. I think learndash is the better option.
So course material - is it ebooks, videos, audio, and do you have exams written?
Sales funnel - where are you getting the leads, what sort of course do they want and what do we want to say on the sales page?
Do you need a forum, livechat, will there be webcasts of the course initially, do you have a design, whats the subject, when is the launch?