Start the puja/aarti. Start the puja by applying tilak to the kalash. Apply the same to the lota that is filled with water. Now offer some flowers to each of them. Recite Diwali Puja mantra. Take some rice and flowers. Join your hands together and close your eyes. Recite the Diwali puja mantra of goddess Lakshmi or just chant her name and meditate for few minutes to invoke her.