When I'm setting up a dungeon the first thing I think about is why its formed.
If it was specifically a defense structure thats going to lead to man made (ish) walls and floors everywhere, doors, adequate ventillation, lots of chokepoints and defensive features etc.
If it was specifically a mine to start it probably has some defenses in the near surface area ( D&D world after all, cant have wandering monsters eating your miners) but after thats its probably lots of long, narrow, twisty passages that were carved to follow veins of ore in the rock without much concern for comfort.
Whereas if it was a natural cave decide if it was caused by water, wind, volcanic forces or tectonic shearing. Then google those things and see how they form cavern systems.
Then decide if those factors are still present or if its a dead cave.
Once you've done that stuff you'll have a very solid idea of what your dungeon should look like.
If it was specifically a defense structure thats going to lead to man made (ish) walls and floors everywhere, doors, adequate ventillation, lots of chokepoints and defensive features etc.
If it was specifically a mine to start it probably has some defenses in the near surface area ( D&D world after all, cant have wandering monsters eating your miners) but after thats its probably lots of long, narrow, twisty passages that were carved to follow veins of ore in the rock without much concern for comfort.
Whereas if it was a natural cave decide if it was caused by water, wind, volcanic forces or tectonic shearing. Then google those things and see how they form cavern systems.
Then decide if those factors are still present or if its a dead cave.
Once you've done that stuff you'll have a very solid idea of what your dungeon should look like.