I recommend going for something short and sweet if it’s your first one. If you want to make a film based on a specific piece of lore, then find a piece that’s simple, short, and pretty straight forward. Something like a brief film about Shin Malphur. Open it up with a shot of Shin as a kid meeting Jared Ward. Then have some small sequences of Jared mentoring Shin, the destruction of Palamon, Jared being gunned down by Dredgen Yor, all leading up to the duel between Shin and Yor. Or maybe take elements from the lore and make your own thing. Something like a horror based film about survivors out in the wilds fleeing from Fallen in a dark environment. I personally think this might be a good starter if these things are something you’ll want to do. Relatively few people, easy enough outfit design composing of tattered and dirty clothing, and an enemy who is concealed by darkness majority of the time (with maybe a few shots of four glowing eyes peering out from the shadows). Just some ideas, but you do you.