This is an awfully big ask and it depends on what you've already done.
I'm currently making a 3d rogue like - my first serious foray into procedural generation - but I'm reluctant to give away too much source code. Partly because the way it generates maps may not be what you want, partly because I'm paranoid and precious about my project.
Have you managed to set up a grid and can essential create the map mathematically and just need help adding the 3d visuals or do you need help with the fundamentals? In other words, can you generate a 2d map and just need help making it 3d? Do you want to create special "tiles" for the various elements or go for a more "mine craft" style of just using boxes or do you not know.
Or do you help with monsters and everything else that goes into a rogue like?