Check your style of printer. For example, if you have an inkjet printer or laser printer, buy transparencies for your type of printer from an office supply store. Take your design into a graphic design program, and tone it to two colors: black and white. When you print your transparency, the black areas will be the areas printed on your final item.
Print your design onto the transparencies. Coat your screen with photo emulsion, using a squeegee. Allow the screen to dry for a few hours.
Place the transparency on top of your light table, and center it under your screen. Place your screen on top of the transparency and light table, using the black paper and weights to cover the top of the screen, and expose your screen to the fluorescent lights.