What happens next?

How to make a planchette
Choose a material.
Traditionally, planchettes are made from a thin piece of attractive wood, such as birch, mahogany, or oak. However, you can make a planchette from any lightweight material, such as thick cardboard, utility board, or a clear hard sheet of plastic.
Cut out a planchette shape. Use a utility knife (for cardboard), a saw (for wood), or a plastic scoring knife (for plastic) to cut your planchette into the desired shape.