Question: how to do amavasya vrat?
Answer: Offer water to Sun and Tulsi in the morning reciting Gayatri mantra for 108 times. Offer water on the Shivling. Offer rice to a cow. Place Tulsi at a peepal tree. ...  Offer home made Puri, Kheer and vegetable to ancestors and then consume same. Donate clothing, food and sweets to poor.