1) Setup your course some where. Here are several ways that come to mind.
- WordPress + Paid Memberships Pro + WP Courseware
- Teachable
- Udemy or many other similar sites

2) Buy traffic from Outbrain or Taboola or Gemini targeting your landing page.

3) Buy small amounts of traffic + tune your landing page content to both match your traffic source terms of service + produce enough conversions to pay for your traffic.