mattweissdesign
Member
Although I'm a new YouTuber as well, I work a lot with advertising and such; just as others have said, the most effective channel trailers are concise (30 - 90 sec). In an energetic way, explain what you do and give people a reason to stay or subscribe. I'm sure you know this already, but what a lot of people do wrong is they will spend 5 minutes explaining what they do on their channel, but won't ever mention reasons why you should subscribe or why its worth checking out more videos.
also it allows you to get a feel of the content creator themselves and how the act and stuff 