I had the same problem and the comments above doesn't relate to your mistake. What the video didn't make you do was cd back to simple_cms . You were trying to execute the rails server command in the Sites folder (thats where the video leaves you) which is impossible.
Make sure you cd back to simple_cms and do rails server.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.