the wya to do the pooja is below clean the temple ie your house temple.Then take lakshmi murthi if not photo will do.if there is a idol then do panchamrita snana by sayin SRI SOOKTA the apply gandh ,kumkum and then offer prasad and flowers and seasonal fruit and dakshina and say the arrti and finish off the orayer lakshmis favourit flower is mallige(jasmine)or any red flower preferabbly hibiscus and offer prasada made of sugar,coconut,cashews,kishmish,dry dates or u can also offer chana.