Bright Creations Drawing Mannequin - Wooden Mannequin for Drawing & Figure Reference - 12-Inch, Wooden, 2-Pack

Just get one of these guys: https://www.amazon.com/Bright-Creations-Art-Mannequin-Pack/dp/B07T1H6FL1 Simple 3d scenes will take you weeks if not months to get to grips with unless you're familiar with 3d software. Unless I'm misunderstanding what sort of references you're looking for. Blender would be the standard choice. Without seeing what you're working on I can't tell your further how "easy" it would be to get what you're trying to achieve.