Make one point and one point only. If you make multiple points in a video, that may make the video a little more confusing. So just break up that video into two videos where you make one point per video.
Different types of courses call for slightly different video lengths, but there are still many rules of thumb you can follow.
1) Definitely stay away from videos over 20 minutes long. If you have a video that long, you may have either gone on numerous tangents, cover more than one point, or speak too slow with too many parasite words like "ummm" and many others.
2) Preferably keep the video under 10 minutes and if you can under 5 minutes.
When I watch my own videos, I notice that my mind can wonder more or less from video to video. Even though watching my own videos is extremely boring, it's a necessary test just like you would test any other product you made.
Surprisingly, some of my own videos don't bore me and keep me captivated. Those are videos that stay on point, aren't confusing, and in which I speak in an interesting way. On the other hand, when the videos are confusing and lose me as a listener, I wonder to myself how I can make such bad content and am almost disgusted with it.
My goal is to keep the videos under 6 minutes in all cases and preferably under 5 minutes. If a point I am making is not complicated, the video can be 2-4 minutes. If the point I am teaching is technical or complex, the video can get up to 10 minutes. But that is rare and I try to avoid it.
In a video that is few minutes long, you can easily introduce a new idea and give an example of it. You can spend another minute or two giving another example, but after that the video will start becoming a bit too long and it will become a case of "more is less."
Common course video formats are talking head videos, picture-in-picture videos, and screencast videos. The easiest format to start with is the screencast because you don't have to appear in the video, which means that you don't have to worry about lighting, how you dress, posture, or anything else related to your appearance. The only thing you have to worry about is how you present and how well you explain.
You don't have to buy equipment if you are on a low budget. Plus, you only need a limited set of equipment for each video genre you choose. Of course, if you have the budget for it, buying better audio and video equipment will immediately help you upgrade your course quality.
This site has a page with my best courses on discounts. The topics range from business to marketing. These are all my best courses. Notice that almost none of them are with co-instructors.
If you don't want to create courses on your own, course licensing is an option. I offer the course licensing option for my 125+ courses through which you can license my courses to sell on your website and keep 100% of lifetime revenue.
If you need additional help setting up your Elearning website and marketing, I offer the Elearning franchise option which comes with my courses to resell, a website, and coaching in one package.
To learn more about how to get into Elearning, here is a comprehensive page with everything you need to get started in Elearning. For more information about anything you ever wanted to know about the Elearning business, take a look at this Elearning FAQ.