creating the channel is easy..Create a YouTube account and post some videos. Getting new subscribers and creating good/engaging content is something else. I'd suggest doing some research on YouTube to see what other people have had success with and then come up with a strategy you want to try, and implement it!
If you have no knowledge of the subject you will come undone instantly. Is the subject flooded will the public love your personality? Marketing is something to consider once you have made content but content will bring traffic if it is Youtube you will want to monetize it.
At the very beginning, you need to sign up for Google account then simply visit YouTube.com. There you will find the option named "account". If you already have a Google account follow the process from the YouTube account section.