Pavithra,
what you need to do is take similar denomination of coins one hand full of yours, and put it on a yellow cloth. To prepare yellow cloth take a white cloth and apply turmeric to it. After placing the hand ful of coins bag it with that cloth and tie 3 knots tightly. Later apply kum kum and pray to lord kartikeyan (subramanya) that clear our paths and improve our financial crisis and welcome us to your temple and give us strenght to perform the sarpa samskara and other poojas mentioned above. At the same pray to your family lord as well. And keep it near the pooja room.
GOD BLESS!!!
Srinivasa Temkar