Join a few Facebook and/or LinkedIn Groups about your course topic or about a related topic that your target market is interested in. Pay attention to the questions that members are asking in these groups. If someone is publicly asking for feedback or help with a specific problem, you can bet that other people in your target market have that problem as well.
To have an effective eCommerce sales funnel, you must first know what a funnel is even is and how to build one. Lead generation and sales funnels come in many different shapes and sizes. And they work extremely well because they often start off with a very simple task, such as a click or an email submit, and then walk the user through a process where they complete more steps (like an eventual sale) over time.