Hi, I'm not an expert on this, but I know the basic steps to do it (a few days ago I uploaded my first video to YT, and it worked perfect lol).
1- You must have a screen video recorder. In Windows 10 it is already incorporated or you can download a pretty good one from here: https://www.nchsoftware.com/capture/index.html it's FREE!!
This allows you not only to record voice and image, you can choose which area of the screen you want to capture, also edit it (see below) and add music, for example.
2- Once you have recorded the video with Debut Screen Recorder, you save it in the folder of your choice. From here you have two options:
A) you can open it for editing with "VideoPad" (it is incorporated and you will see it as a separate icon on your desktop). It is easy to do, the program itself has a kind of guide when you open it for the first time and if you position your cursor over a tab or button, it tells you what they are for. Once this is done, you save it with another name.
B) you upload it as you recorded it without editing.
3- * open your Youtube channel
* go to the upper left and click on the three horizontal bars, just to the left of the youtube logo.
* in the menu that will be displayed below; click on "your videos"
* once in this section "Channel Videos" you will clearly see a figure and below a colored rectangle that says "upload video" click it. The video will be hosted here once you have uploaded it and from where you can easily choose the options you want to choose to display in your video.
* now in this image box that will appear, choose "Drag and drop video files to upload" or "SELECT FILES"
* then,the Windows explorer will open, showing your folders. Navigate in it (the same thing you have done thousands of times for open a file or proram), choose the folder where you saved the video and then the file; click on "Open" and ... DONE !! charging should begin.
* after this process is finished, in "Channel Videos" as it says above, choose the different options: Title, Description, whether it will be public or not, etc.
It may be good if you make a short test video (20 or 30 sec) before recording the one that really interests you.
Hope this can be of some help; like i said i'm no expert but that's how it worked for me.
GL