Nice to see that you're offering an online course like this because your English is awesome. I guess it's a beginner course?
I discovered udemy for myself as well a few weeks ago and started a Photoshop course as well as a Japanese beginners course and I'm very satisfied with this service. The courses are always discounted which means they are really cheap but very high quality! I guess it was @inspiranka who gave me the final impulse of starting a course there :)