To paint wood Christmas ornaments, you'll need some basic supplies. Start by choosing a few different colors of paint and some paint brushes. Make sure the ornaments are clean and free of any dust or dirt. Next, use the paintbrushes to apply a thin layer of primer to the ornaments. Let the primer dry completely, and then start painting with the colors of your choice. You can add details and decorations to the ornaments using small brushes and stencils, if desired. Once the paint has dried, you can add a sealant to protect the ornaments from scratches and fading.