Dguerr---- Definitely do as much research as you can. Afterall, you might get interested in the coin hobby.
But, over many years, I've found that if you post decent pictures on Ebay----and list the coins fairly---the buyers will determine the current fair market value for you.
I've seen it happen that folks don't know a blessed thing about the coins that they list---but receive more than they ever thought that they would get. Dealers, on the other hand, will many times undercut a coin's value---once they find out that the seller doesn't know what they have.
Getting an old Red Book---or virtually any price list---will give you at least a "retail price" that will give you a starting point. Also, posting pictures here on this chat board would be helpful---as all of us just like to guess grades and values. Good luck to you in any event. Bob [supertooth]