I don't think you can directly list it for auction you have to wait until someone puts a bid on your domain then you can decide, otherwise we all would do it! If you want to place a domain up on the homepage though you can pay to get into featured listings section although it is quite expensive.
i would recommend listing them for sale here, sedo can be ok at times but it will take ages and will most probably have to wait for an end user. Plus if you do sell they take 10% of fees...