I've collected some free script resources in the left column at THE STORY SPOT (rather than relist them here). Maybe, as a start, you could try something simple and straightforward such as "Liar, Liar" or "The Bourne Identity"or something similar where there is one major plotline and not a lot of complex relationships and/or twists. You'll better be able to see the beginning, middle, end, and protagonist's arc. Maybe even choose a story you don't love or have seen many, many times so you don't get so swept up. Having said that, I think I probably learned the most from breaking down films as I watch them. That means several hours, a fresh pen, and making friends with the pause button and run-time display. /djw