There's lots of ways to sell your stuff , and which way you decide to go is , as railman stated , your choice .
Auctions/auction houses can take a big margin away from you , most on-line sites have their costs & twists and turns as well .
Perhaps you might consider how much dough you're trying to get , before you make your choice .
Auctions/auction houses , consignment shops & etc. often reject items of low value .
With shipping , insurance , advertising costs , taxes & etc. ......
You might consider something like free ads on craigslist , if they are available in your area .
Also , perhaps a 'estate sale' ad in your local paper .