You don't mention whether your copy is an original or reproduction and obviously the latter is going to be worth much less.
If you are unsure with your painting is a copy, you can check on the official Robert Wood website robertwood.net/how_to_tell_reproduction.
A good quality large framed reproduction Robert Wood painting could be sold at a minimum price of $20.00, although eBay carries some Wood reproductions on sale for $50.00. Of course, this doesn't mean necessarily mean they'll get any bids.The auction site primetimeauctions.hibid.com appears to have sold the original 'October Gold' by Robert Wood earlier in 2014, with the painting fetching a price of $65.00. This is likely a copy, so unless you own the original, this would be a rough value of your painting.
If you own the original, well, originals of Wood sell for four and five figure sums on eBay, around $5000 to $20000, but you will need to have your painting authenticated first if you intend to sell.
You could discuss the possible value of your painting at dart.fine-art.com, an online art community with several threads dedicated to Robert Wood. askart.com/AskART/artists/bulletin is a similar site you could try.
Check out other Blurtit answers to questions about Robert Wood by reading What Is A Original Signed Robert Wood Painting Worth? or What Would A Signed Autumn Leaves 1959 Painting By Robert Wood Be Worth?