To start with, you should define a specific goal. Do you want to drive traffic from videos to make direct sales or to build a list you can later monetize? Do you intend to use a lander to pre-sell or direct link?

The answer if you are not good at making videos is to outsource the video creation. However, you'll want videos that include a voice over and you'll need a script also unless the video creator writes one, so it could cost $40+ per video, depending on the video length and type of video.

You can always outsource the video creation part on a site like Fiverr, once you have the niche ready to promote. In this case, you are referring to the health niche, I do not think that is a niche one should go after considering it doesn't do that well on Youtube traffic but you can always add your own twist to it. My take would be to promote gaming campaigns, as it's a very popular niche on YT.

If you arent good at making a video, take a few tip: choose you niche, use camtasia to record, be confident and make it simple. If you still cant make a video, go through fiverr to hire pp to do it for you.