This is what you need to get started. A door or piece of wood, an old frame would work even with some thin wood in place of the glass. I also had some spray paint, wooden numbers (the year we got married), liquid nails, hammer, hanger, 2 small nails.
Then I painted my numbers with the spray paint a couple of times and let them dry completely. While drying add the hanger to the back of your door with your nails.