Standard fireplace with a wood burning stove insert
I have a split foyer, and down in the basement I have a wood burning stove that the previous owner installed in a regular fireplace...or what seems to be a regular fireplace. He told me that if I wanted to remove the wood stove, I could, however there is no fan in the chimney itself to help pull the smoke up and out. I can't use the current wood stove because the door is broken and the company who originally manufactured it went out of business (it's 34 years old). It's also 2/3 the size of the fireplace opening itself, and it just looks goofy.
My question is, should I just buy a new larger wood stove and install it where the previous one used to be, or would it be better to just forget it and use the fireplace without it? How difficult would it be to vent it if I did use it like a regular fireplace? I've never tackled a project in this area before, so any input would be appreciated!