1) Go To An Appraiser
Ultimately, it can be hard to determine the value of a coin on your own. Even with all of the resources available, getting expert advice is the only way to definitively know what coin you have, especially if you plan on selling.
Local coin appraisers are great sources, especially if they are backed by a professional numismatist organization. Use these sources to find local coin appraisers near you:
• Professional Numismatists Guild List of Dealers
• Professional Coin Grading Service (PCGS) Authorized Dealers
• List of Local Coin Shops (incomplete list)