Let me give you an advice about filming for youtube as a super master who knows everything in the world and no one should dare to question it.

Make a script, memorise everything you've prepared.
Then forget it and just be yourself. When you feel like you need to be funny - be serious, when you need to be serious - be funny.
The best youtubers that I watch are the most entertaining when they just be themselves not because of the script, my padawan!

Okay, master is out, mic dropped, you're welcome!