A few things that I would think about when making a channel about vlogging.
1. Vlogging in general
From what I see, most successful vloggers are either people who started doing something entirely different (for example, gaming) then slowly transitioning into vlogs. For example, FaZe Clan. I don't watch them anymore, but they started out just as a gaming clan. Now most of the people in FaZe are just vloggers. It works for them because they had an audience of people who knew who they were and liked their personality. Going into vlogs would be easy as they already are connected with an audience that's interested in them as a person.
Another way vloggers are successful is what they do in life. If you aren't doing interesting things in your vlogs, people most likely won't stick around and subscribe. That's pretty much it in that regard.
I don't know how I feel about this side of vlogging. I always see people talking about their "brand" when it comes to vlogs. I think its kind of odd to brand yourself in that way. For example, Logan Paul always talks about himself as a "brand". In my opinion, I don't think you should aim to "brand" yourself, its an odd concept to me for a vlogging channel aiming to make themselves a brand when they're just people.
Unless you're just talking about being recognized for what you do yourself/being unique, then I get you.