So fist you are going to need to have some thing to do. Then get what you need. If you are doing a real life video then get a camera and if you want get a video editor. Now if you want to record you screen you will have to get a program called Bandicam. Then make you video. Once you are done with that get a youtube account and upload your video.
About me making Youtube Videos
So I do minecraft videos and use Bandicam. So first I get an idea on what to do on my video. Then I start my recorder I just try and make the video if I mess up I just try again.