No sugar coating from me, Locate a dealer like anything else, Google,
eBay or here, just so ya know 99% of all stamps grandpa, auntie had or some stamps found in the attic will not be worth.................... It is what it is. Old stamps don't mean automatic big money. Old stamps are usually just old stamps and newer stamps are just stamps. You will need to search on your own as most dealers will evaluate your holdings in less than 1 minute if you do not know what you have.