Acquire or create a Ouija board. Also known as a spirit board, the Ouija board is basically just a flat surface with all the letters of the alphabet, the numbers 1 to 9 but instead of a 10 ,write a 0, Yes/No, and "Goodbye" written on it.
You'll also need what's called a "planchette," or some kind of movable indicator to use to point to the letters. A shot-glass is a common substitute, but any talisman you can all put your hands on to indicate the letters would be appropriate.
There's nothing magical about the Ouija board itself, so you should feel free to create your own on simple paper, or buy a more stylish one if you like.