I think the best you can do is to go on the birkbeck website, the BA in Journalism and Media page and just look through the modules that they're offering. Go to your local library (or the London Library in St. Pancras) and compile a reading list of journals, books, articles, essays, etc. to read.
Also, Google is your friend! There's Google Scholar which I love to use to read up on interesting subjects
Good luck