I can see you're trying, and I appreciate that. But you have a lot to learn.
Okay, let's begin.
Recording Software
There is a watermark for bandicam at the top, and you can see parts of the window. I suggest getting either Mirillis Action! or Fraps for better framerate and quality.
Making it Look Professional
At 1:00, you typed "0_0" into the chat. Don't do that. Your HUD is also showing, which looks bad. To fix this, disable "Show HUD" in your graphics settings.
Get the camera stuff mod too, it allows you to hide everything but the game and freeze the camera. It's a really great tool.
Editing
I can tell you're using windows movie maker, which is a bad sign. You should consider "buying" better software, like Sony Vegas or Adobe Premier Pro.