Take a meter reading, set the aperture and shutter speed for the ASA of the film you are using then release the shutter, like any other shot in any other place. Sorry made the switch from film to digital last year... have yet to get in the digital mode of thinking. Before putting the old X700 away, I burned 2000 feet of Kodak 25 ASA technical pan I had stashed away in the refer, wish they still made it.
I understood film, could push or pull it, adjust development time to compensate for how I exposed it, tinker with light and time while printing, dodge and burn as needed, learning digital is like trying to learn Swahili.