Once you've figured out a film or technology you're interested in, there are a number of ways to incorporate primary and secondary sources into your research! You could turn to movie scripts to get a better sense of how technologies are described, you could find reviews and commentary on your movie in entertainment magazines, or you could turn to academic criticism for an expanded view on the critical discussions around your film. Below are just a few resources you can use to expand your argument with sources.
Articles in important academic journals from all disciplines (latest few years not available); also eBooks from leading academic publishers, as well as some images.
Current humanities and social science journals from a variety of university presses.