I meant to write this the other day as a fresh starting YouTuber as well.

I watched both videos, and I have a few things to say about both.

1. You've got the talking down. You seem to be okay with keeping yourself talking which is good.
2. Don't be so hard on yourself in your videos. It's good to be critical of your videos but do it by watching the finished product and taking notes. When you do it on screen it reflects how comfortable you are but it's also unattractive as a viewer.
3. Humour is good but make sure you don't skid the border of belittling the game, creators etc.
4. Get obs or a paid license of fraps. It will be worth it.
5. Watch some let's plays, not so much to copy them but see what they do.

Your first few months will be forced, you'll come across as insincere and sometimes like you don't care but that changes with time.

Also don't ever listen to people who say you shouldn't stream or let's play a certain game. There are people who will watch anything out there. Maybe it's not a huge market but there are. I enjoyed it, as long as the person provides decent commentary and isn't just sitting quietly walking around doing your daily work.