To search for a script or screenplay, use the library catalog and search by author of the writer, or name of the film. The University Library has a fraction of the scripts available through the CTVA department due to copyright and publishing restrictions.
You can watch up to 10 films a month on Kanopy (LAPL) through Los Angeles Public Library, including some films that may be required for your class.
They have a collection of more than 30,000 films including documentaries, independent films, and the Criterion Collection.