What should I do for my first YouTube video?

What are your videos going to be about

Whatever you want. You don't have an audience yet, so it's better to make what you want. When you start building a big audience, then you should consider what the audience wants

a demonstration on how to cut hair into pixie style and then how to apply witch makeup

Knit a pretty scarf!

What are you in to?

Bake a cake