First question is what format the movie(s) are on, if its a recent release, then it'll require DCP capable equipment, and this is specialist territory. Call Boston Light and Sound.
If it's on BluRay, then any old BluRay player and any old projector will do, but the better the projector the better the movie will look. The BluRay player of choice is an Oppo, now sadly discontinued, as it has the ability to suppress onscreen-menus, and be remote controlled, and has 5.1 audio outputs.
Sound: most "any old BluRay players" have a pair of phonos (RCA) for stereo out, and I'm sure you'll know what to do with those. if you've got an Oppo or something with 5.1 outputs, then you can run L/C/R and stereo surround.
Officially, the dialogue, which normally should be -20 dbFS, should be at a level of measured level of 85dBC half way back from the front, though for many movies and audiences, that ends up way too loud. Try to get the subs as flat to as near as 20Hz as possible.