How to sell my Course?

Hi,
I created a course to sell and i want to try this kind of making passive income, the course is completed. I created it professionally with high quality video, Audio and content.and it is from a unique niche, and it has low competitors,
In this thread I don't want to talk about if it is a good way to make money or not or about the course content, Now it's time to publish and sell it, I haven't any lead audience in social networks, so I'm thinking to sell it on Udemy.
But before this, I want to plan to how sell the course to avoid fail at the beginning...
Do you have any idea for me about the best platform to sell my course? Any idea for marketing?And any other tips and ideas to make this course more popular and moneymaker?
Black hat marketing and SEO methods that can help me in this selling?
Your opinion will help me.

Thank you

Social media is important. You can easily run targeted ads there to help your audience discover you

Udemy is good as they'll add to the trust factor. You can later move on to a private landing page. Or alternatively you can even use services like Gumroad and paddle.
For marketing, you'll have to run ads. You can get free traffic from FB groups and answering quora questions. Don't just go to these platforms and explicitly sell your course. Give valuable info and try to help people out and then link your course at the bottom or in the comments.

Just implement the course you created and you will make money