If you attempt to sell it yourself, you're going to have to post much better pictures of the table and chairs in order to attract some interest. The inlay of your table top, appears to be burled walnut

If it has a manufacturer's label, that might help. Henredon & Century both had dining room sets similar in style at about the same time. Since the style is not in demand presently, you might be fortunate to get $500 for the complete set. More if you live in a big city with a diverse population. Sometimes it's better to take the write off and donate the set.