How do I make a professional YouTube channel?

Depending of which field of Youtube your going into wether it's Gaming,Beauty,Vlogging ETC.

ALWAYS! strive for quality !

- Get decent equipment
- Invest time into planning your setup and video style.
- Practice Editing and Recording Videos
- Get a good banner for you channel (Ask a graphic designer or get a free template to customise online)
- DON'T upload a video your are not proud of
- Make sure you have a trademark, wether its a logo or saying. And use this in every video ! Unique is Professional

If all else fails, make some funny videos and grow your audience. Eventually from trial and error you'll find you own style

Hope this helped