A few tips for caring for callas indoors:
Keep the soil moist, but not soggy
Provide bright, indirect light
Apply liquid fertilizer monthly while in flower
Keep away from heating and A/C vents
Reduce watering when the plant enters dormancy (November)
Cut the leaves off at soil level once they've died
Allow callas to rest in a cool, dark area during dormancy
Repot annually before the growing season