These videos by Bruce Cahn make a good introduction to the field camera. He shows opening the camera, focusing, movements, and film insertion.
If you haven’t used a field camera or press camera before, please note that you might not have all the movements that he has on his Ebony field camera, but his Ebony camera will provide a good introduction no matter what your model.
Using a Wooden Field Camera Part 1
Using a Wooden Field Camera Part 2
Here are some other field cameras.
Here are Ebony field cameras like his.