2) now you have got the log up option in that, so you can use your already existing ID and password
3) then you can log up(or sign up)
4) if you joined once then you can do anything in that what facility will be there in that.
Don't put a fake email - if you forget your username or password you need your email to recover it. My cousin had to hack and stuff to fix it when I did it to my tablet.
Just click the signup button and follow the instructions. Or you want to become a content creator? It would be much more complicated. You'll have to get familiar with video editing, find sources where you can buy youtube views to grow your channel faster and coming up with good ideas for youtube videos also is much harder than it seems to be.