My approach on selling my own course for a couple of months now:
1. Create 3 engagement (PPE) ad videos via Facebook Ads showing some stuff related to your course (value-based videos)
2. 4th video would be the pitch: you can sell the course for those who've engaged with your ad before (those 3 videos above)
Of course, it really depends on your pricing strategy. If your course below $50, you may not even need this complicated stuff and just offer your course in membership style, upload them to teachable, and say that for the first 7 days it's $1, and then it will be $19/month, or, if you don't want memberships (no future content will be posted, just this static one), you may sell it for $37 one time fee. Anything like that.