Check out this tutorial at the link below

WATCH THIS TUTORIAL
PART 1 – Backrooms 2K – 46 min

PART 2 – Backrooms 2K – 43 min
PART 3 – Backrooms 2K – 40 min
PART 4 – Backrooms 2K – 36 min
PART 5 – Backrooms 2K – 60 min
PART 6 – Backrooms 2K – 41 min

Part 1 –  46 min

      – Introduction
      – Modeling rooms, walls, ceiling
      – Creating materials
      – Camera setup
      – Creating lighting

Part 2 – 43 min
      – Creating walls and mazes
      – Ventilation modeling

Part 3 – 40 min 
      – Smoke detector modeling and texturing
      – Pipe modeling and texturing
      – Compositing in Blender
      – Adding mist and camera imperfections
      – Adding graffiti and dirt to the walls

Part 4 – 36 min

      – Add details (cables, trash, edges)

Part 5 – 60 min

      – Creating details
      – Camera animation (2 ways)
      – Import and animate reptile (Mixamo)
      – Rendering and exporting animation from Blender

Part 6 – 41 min

     – Post-processing in After Effects (if you do not use After Effects, this part is optional, it can also be done in a blender)
     – Finding and adding VHS Overlays
     – Creating sound effects

Check out this tutorial at the link below

WATCH THIS TUTORIAL