I have a special (can you believe it) sprouting jar. It is a plain glass jar with a screw on lid that has screen instead of glass across the top. Honest, I bought it years ago. But as I recall, before this miraculous jar I covered the top with a layer or two of cheesecloth and secured it around the neck with a rubber band.
Cover the bean with water and soak an hour or two, then drain, rinse, drain, rinse, and drain again….real well.
Keep in a dark cool place (but the refrig…too cool…I usually use the oven or the microwave) and rinse and drain
every morning and every evening. In a couple of days you’ll have sprouts. Good luck!