one of the hardest things personally for me was to go back and study the times and the politics surrounding Watchmen. Rorschach has extreme right-wing, anti-liberal views and considers Truman a personal hero for dropping the atomic bomb. I'd also bother to look up Reagan and his presidency as well.

since you'll probably be writing him fighting at some point, I'd also look up boxing since that was a huge part of Walter's upbringing.