Since Lakshmi puja is essential ritual on Diwali.Diwali Puja should be done at an appropriate Diwali Puja Muhurat considering fixed Lagna, Pradosh time and Amavasya Tithi.
Sri Suktam, Lakshmi Suktam are various hymns to do worship of Goddess Lakshmi in Sanskrit language. But those who do not know Sanskrit, there is a puja vidhi of Lakshmi ji available. This puja is very effective because it is the puja of Lakshmi panchyatan.it is believed that those who do Lakshmi panchayatan puja, is blessed with grace of Goddess Lakshmi very quickly.
Collect all these things together at one place.
Spread red cloth on puja chawki.
Place idol of Goddess Lakshmi, Saraswati and Lord Ganesha on chawki.
Place 3 heaps Akshat in front of Goddess Lakshmi for Lord Vishnu, Indra and Kuber.
Light a diya to start puja. This diya should be kept lit whole night.
Offer some flowers, akshata (sacred rice), and a supari to Lord Ganesha. Chant Ganesha shloka and offer your prayers so that he helps you get rid of all obstacles that come your way.
Next, you should pray to Goddess Saraswati and request her to give you the intelligence that can help you succeed in life.
Now start Lakshmi pujan. Put Tilak of roli and akshata on forehead of Goddess Lakshmi.
Offer dhoop, flowers, sweets and to Goddess Lakshmi.
Now offer cotton seeds , coriander seeds, turmeric, silver coin, currency notes, supari to Goddess Lakshmi.
Once you offer your prayers to Goddess Lakshmi, you should worship Narayana with complete sincerity so that you can please him as well as Goddess Lakshmi who is believed to reside at the place where Narayana stays.
Pray to Lord Kuber , Lord Indra , Goddess Saraswati along with Goddess Lakshmi.
Do worship by offering earthen lamp, scent, flowers, dhoop and sweets.
Next, you need to perform the aarti for Goddess Lakshmi.
Maa Lakshmi Aarti
Jai lakshmi maataa, maiyaa jai lakshmi maataa