Santoshi Mata Pooja is usually performed for a period of 16 Weeks on Friday.
You will be required to have a Santoshi Matt Photo, the Pooja book which contains the story and for prasad you will need roasted chana, jaggery and green banana.
"You are not supposed to eat or touch anything which is sour like Curd, Lemon Etc"
On a Friday morning have head bath and place the photo in a clean Pooja area and put a small Kalash. Place Santhoshimatha's photo and decorate it with flowers. Keep channa (soaked in water for 6 hours in water) or puffed bengal gram along with jaggery piece and bananas as prasadam. Light diya before the Goddess. Chant the mantras and read the story and give aarti to the Goddess and have prasadam. You can do fasting the entire day or can have food only once in a day (may be supper or dinner). You are not supposed to eat anything sour on the day of the Pooja...
You need to do this for 16 weeks on Friday, and after you finish the 16 weeks you will be required to do Udyapan, i.e. you will be required to offer food to kids and remember not to feed them anything sour and not to give them any cash, as they might use the cash to buy something sour.
First gather the things required and then start the Pooja.
Things required for the Pooja: