1. mostly comedy and educational videos, some food, tech and sports
2. conan o'brien because hes hilarious, ted, munchies, nerdwriter1, barbell brigade, the verge, unbox therapy etc --they're interesting, and produce a lot of interesting content. i like learning and laughing so as long as ur channel has all that i'd watch u all day
3. i guess if the creator sounds unenthusiastic? or the content and quality are terrible.
4. man as long as you engage with your audience and sound like ur having a blast recording, ur good. maybe u should do vlogs? record whatever you love doing and put it out there because there's always going to be an audience. its just a matter of time before it takes off
good luck!! keep us posted!