Well, what I know is that Superman was sold to Detective Comics in 1938
The character was created in 1933 but didn't debut with DC comics until 1938.
I really  love Superman and the the comics Awesome, I know that this character was created by high school students in 1933. I never knew that, maybe it was his alter ego? Honestly, I am not sure about that. I am sure that the two high school students who created the character were living in Ohio. That is kind of exciting, Superman is from the 40's isnt it?
They sold Superman to Detective Comics, the future DC Comics, in 1938.