To put up Christmas lights on a house, you'll need some essential tools and materials. Start by purchasing a set of Christmas lights that are rated for outdoor use. You'll also need a ladder, a staple gun, and some zip ties or clips. Then, carefully measure and mark the areas where you want to place the lights on your house. Next, attach the lights to the roofline and around windows with zip ties or clips. Finally, use the staple gun to secure the wires to the house, making sure to keep them tight and out of the way.