Images courtesy of Flickr users (in order of appearance): Nathan Rupert; Tony Brooks; Carsten Brink; Geraint Rowland; Francisco Anzola; & Etienne Valois.
The SCU library provides streaming video for thousands of films. The Kanopy database (like Netflix for academics) is one place you can access films about global Christianities.
Encyclopedias, dictionaries and other reference sources are a great way to get started and to find background information on your topic from various perspectives.
In addition to reference sources specific to religious studies, general reference sources can provide information about aspects of global Christianities you might like to explore.