If you are unsure of the value, I would either have it appraised by a reputable antique dealer or at least see if you can find a comparable on EBay to learn what they sell for.
You can advertise it locally, sell it to an antique dealer or put it up for auction on Ebay which would require packing and shipping it.
EBay link:
http://popular.ebay.com/antiques/spinning-wheel.htm