New GM attemping to get ideas for a campaign down something similar to a tabletop fallout game.

**How much info is too much info for general prep? Can there ever be too much? Or is there a general balance between the GM's plans and the PC's being PC's.** Level differences aren't too big a deal in the game I'm running (All Flesh Must be Eaten) but they can happen. Do I want to specify everything in the room and say how things are meant to be used if they find them? or allow more creativity on their part.

eg: Going with an "If it's reasonable for it to be there approach let it be there" or "I didn't say specifically anything interactable was there, so you can't use it."