I think you've already started by now, but just in case you haven't... I started with NYU's prompt. My introduction briefly stated an issue I'm passionate about, my professional experience, and how a Master's degree will help in achieving my career goals. Before writing out the body, I made a list of things I wanted to mention under each question. From there, I started forming them into paragraphs. I gave specific examples of my learning objectives at NYU. (i.e. what population I wanted to serve and electives that would help build my portfolio)
Completing my NYU statement of purpose helped with the Fordham one. I was able to use most of what I wrote for NYU for Fordham. I just deleted my paragraphs about my attributes (Fordham doesn't ask) and replaced my learning objectives at NYU with Fordham. I also changed the conclusion a little bit.