We’ve written a bit about defining your target audience, but suffice to say that if you still haven’t done this, then don’t bother moving on to the next steps in the sales funnel. You must have some idea of what people are interested in your topic, where they are hanging out online and what motivates them in order to begin creating awareness of your course at the top of the funnel. If you just start sending out emails and tweets willy nilly with no real plan, your efforts (and you will read later on that it is a lot of effort) will be wasted. You need to know that you are creating the right content for the right people.
If you're wondering what a sales funnel is, simply imagine a real-world funnel. At the top of that funnel, some substance is poured in, which filters down towards one finite destination. In sales, something similar occurs. At the top, lots of visitors arrive who may enter your funnel. However, unlike the real-world funnel, not all who enter the sales funnel will reemerge out from the other end.