"Pen and Paper" is probably just some form of metaphor. I know that this song is written about record companies (or something along those lines) as Ronnie said it in an interview recently. So I'm assuming it means something like "We're the pen", which does all the hard work, writing the songs and producing the music, while "You're the paper", while not as important, we need you to make it. Or something along those lines... I suck at this kind of stuff really lol.