To create an elf on the shelf, you'll need a few essential materials. First, you'll need a small figure of an elf. You can find these at most toy stores or online. Next, you'll need a small basket or crate to act as the shelf. Once you have your materials, you can get started with the assembly. Place the elf inside the basket or crate, and then use a small amount of hot glue to secure it in place. You can then add a few festive decorations to the basket, like small ornaments or holly leaves, to give it a holiday feel.