Good point about the film speed setting. That's only for TTL-OTF flash. This requires a flash with the proper interface module. The flash goes off bounces off the subject goes back through the lens bounces off the film to a sensor in the body. When the sensor/module determine the flash duration is adequate, it shuts off the flash. Pretty neat but it doesn't come into play with much of what you do.
You can use a regular flash as well. You need a meter prism to take ttl meter readings, no automatic settings, pure manual perfection.