Welcome, and so sorry to hear you need to sell!
The Ravnheart link is a good start, but it’s now three years out of date. Some prices seem to have risen, and others seem to have dropped in that time. If you happen to have any eBay pieces later than 2009, or any Limited Production pieces later than that, they won’t typically be listed.
Searching ebay’s current completed listings for Windstones, noting especially those that have actually sold, *may* give you a more accurate range for your pieces.
It’s also not a bad idea to check the threads on the first couple of pages of the Flea Market, to see if anyone is looking for any of your specific pieces–they may have attached a price range they’re willing to buy in. Likewise, looking at what’s for sale may also be helpful.
Best of luck to you!