Write down all of the details you have related to the rug--the dimensions, the date it was made, who made it, where you got it from, what it cost you and the condition.
Take a photographs of the rug. Handle it carefully while you are doing this. You do not want to damage it. Lay it down on a soft surface, such as a bed next to window with good light. Take photographs of the entire rug, as well as a shot of the back and closeups of anything that is particularly interesting, such as initials or a date.
Research your rug on the auction site eBay to see if you can find similar rugs to compare to yours. If you feel your rug has special qualities you do not see in these comparisons then contact a specialist at a museum such as the Shelburne Museum in Shelburne, Vermont (see Resources). If he advises you that it is a valuable rug, then contact a representative in the Folk Art or Antique Rug department at one of the two major auction houses in New York such as Sotheby's or Christie's.
Find the contact person in the Folk Art or Rug department of an auction house. Send her an email stating you have an antique hooked rug you are interested in selling. Briefly describe it and ask if she would like to see photographs of it. The benefit of contacting a high-end auction house is that it will be able to compare your rug to rugs that have sold at its establishment. Even if it is not interested, you will learn something about the value of your rug, and often the specialist at the auction house will advise you where to sell your rug. If it wants to handle your rug, that's a very good sign.
Look over the auction house's contract, paying particular attention to the percentage it takes and any other fees. For instance, check to see if there are any fees to have it listed in the auction catalog. Find out if you owe the auction house money if the rug doesn't sell. And of course, check to see when you will be paid. (Typically, it is 30 to 60 days after the close of the auction sale.)
Package your rug very carefully in plastic to prevent moisture damage. Insure it for the estimated value the auction house has given you.