For optimal growing, keep your bulbs in a cool (50-60 °F) spot, out of direct sunlight, for a couple of weeks until the roots have grown.
After this rooting period, put them in a bright warm spot. Some people recommend putting them under “grow lights,” or florescent lights. Or, if you want to speed up the flowering you can also use a heat mat or heating pad underneath your bulbs.
That said, I usually just plant my bulbs and put them on the kitchen counter, which is bright but gets no direct sun. With regular watering, but without any extra attention they do fine.
Paperwhites have a tendency to fall over after they flower. This is more of a problem if they are in a shorter container. To prop them up, I use some chopsticks or bamboo stakes stuck down the sides of the vase or bowl and encircled with twine or decorative ribbon.
