You could choose a name based on your name (perhaps some variation); or you could choose a name based on the purpose of the channel. Or some combination.
Your YouTube gaming name should be something original. You want a name that people will remember. If you have a favorite sport or activity, you could add this to the name.
Dahfeefies? Dahfeefers? Dahfs?
Once you create a YouTube username, you will not be able to change it. However, if you were affected by the Google+ to YouTube name change, you should be able to edit your preferences for the name displayed in your account settings.
While you're uploading your videos, there should be something like Title...that's where you put the name for your Youtube video.
You can use anything you want. It can be as simple as your name with 123 after it.
You can go to Youtube, Itunes (you have to buy the soundtrack though), and if you have the name of the song type it into youtube and it should be there.
How about I Feel Pretty? :)
Most people use their names.
If you just click the YouTube search bar and type in the channel's name, it should come up.
you can just google his name and there should be plenty of pictures :) or youtube it
Something creative on the topic that you are going to vlog about
When you are uploading your video, as it is uploading to YouTube, there are empty boxes below the percent loaded box. There should be 'Name' or 'Title' next to one of the empty boxes, and that is where you name your YouTube video, and the Description box is right below the title box.