Remove flower heads as soon as they begin to fade to discourage seed production. Producing seesds draws from the paperwhite's energy reserves -- they need this energy to survive dormancy.
Place the paperwhites in a sunny window, and water so that the plant does not dry out. Leave the foliage to naturally wither and die, instead of cutting it back. Apply a small amount of water-soluble fertilizer monthly until the paperwhites have died back completely.
Prepare a bed for the paperwhites by loosening the soil by hand or with a rototiller. Incorporate plenty of compost and phosphate fertilizer into the bed. Plant the dormant bulbs 6 inches deep in the soil.