Offer sweets & coconut. Offer coconut and place a supari on a supari leaf. Now put some haldi, kumkum and rice over it. Pour some puffed rice, coriander seeds and cumin seeds over the idol. Place some mithai, Diwali sweets, fruits and money or gold ornaments in front of it. Perform aarti. Worship the idol by performing the lakshmi puja aarti.