I would suggest getting them appraised if you don't know their value. Then go down off the main page to you see MarketPlace. Find what fits your names; if its just a normal domain then post it in Domains for sale-fixed price or Domains for sale-make offer. Fixed price is if you have a price set for it; make offer is if you have no price. It is helpful to include any traffic, register, and when it expires information.