Kalkazhukichoott( washing feet as a sign of respect) for 12 brahmins considering them as 12 forms of Lord Vishnu ,making them sit in proper places & giving them dress, sweets & other foods to please them .Prosperity in 12 months is what we expect out of Dwaadasanaama pooja. This is done in the morning. VishnuSahasraNamam, Purusha-Sooktham, NarayanaSooktham and the like are used during this Pooja. DvadasaNamam, AshtotharaSatham are also used for Pushpanjali, Palpayasam (Milk Pudding) is the main offering.