At the time of Ganesh Puja, the idol of Lord Ganesh is placed on the right while Goddess Lakshmi's idol is kept on the left hand side on the platform prepared for the Diwali Puja. Next offerings are made to both the idols of perfume, haldi, flowers, sandal paste, kumkum, gulal and garland of cotton beads.
The flowers mainly used for Ganesh Puja are the marigold flowers and leaves of Bel or wood apple tree. Incense stick and dhoop are also lit in front of the idols along with offerings of sweets, coconut, fruits and tambul. After making all these offerings Ganesh Aarti and Lakshmi Aarti are sung for honoring both Lord Ganesh and Goddess Lakshmi.
The main belief responsible for including Ganesh Puja in the rituals of Diwali is that Lord Ganesh should be pleased and honored to ensure hassle free passage for the accomplishment of wealth, health and prosperity.
Here is Lord Ganesh Aarti, which should be sung at the time of Ganesh Puja for paying reverence and respect to Lord Ganesh.
Jai Ganesh Jai Ganesh, Jai Ganesh deva
Mata jaki Parvati, Pita Mahadeva.
Ek dant dayavant, char bhuja dhari
Mathe sindur sohai, muse ki savari, Jai
Andhan ko ankh det, kodhin ko kaya
Banjhan ko putra det, nirdhan ko maya, Jai
Pan chadhe, phul chadhe, aur chadhe meva
Ladduan ka bhog lage, saht kare seva, ,Jai
Jai Ganesh, Jai Ganesh, Jai Ganesh deva,
Mata jaki Parvata, Pita Mahadeva.