Since I was still having trouble wrapping my head around the stylistic essence of the screenplay, I thought of a simple solution: imagine it's an RPG. For non-nerds, that acronym stands for role-playing game.
Yes, I used to do a lot of text-based RPGs online, and they were nothing but description and dialogue, like this:
**The Fellowship emerges into a swamp full of itchy insects.**
Frodo: I hate mosquitoes! *scratches madly*
Strider: We don't call them mosquitoes in Middle-Earth.
Frodo: What do we call them?
Pippin: ARRRGH! *disappears under a wave of swamp water*
Frodo: I hate my life.
For some reason, thinking of a screenplay as a formalized RPG makes it much easier to write.
I could go study how Shakespeare used description and dialogue in his plays. That sounds much more cultured and intellectual. But to be entirely honest, I have spent more hours pretending I lived in Middle Earth than I have reading Shakespeare.