Wood-burning stove repair?

i live in ohio and i have a wood burning stove in my home to keep us warm. I do believe its put together wrong and there is always a black creasote liquid leaking down the pipe that goes into the ceiling. Its starting to stink my house like smoke. I would like to call a repair man or a professional to come fix the fireplace but i dont have enough money for it. what should i do to get it professionally fixed with no money?