You can send it to a 3rd party grading service like NGC or PCGS.
Coins are certified by NGC and PCGS. A coin shop can help you or search on the internet. It costs something to get a coin certified.
Rare Coin Wholesalers was created in 1990.
They are not rare.
You can buy them at coin dealers and coin shows.
Just the year does not make a coin rare.
No, they are not rare.
It means that the coin is rare. For example a 1909-S VDB cent is a key date. This coin is rare.
No.
Determine how many were minted, when and where and the numismatic grade and, last but not least, the availability of the coin for purchase
The purpose of a Certified Coin Exchange in the United States is to facilitate coin trades between collectors. It allows collectors to find buyers for their coins through a trustworthy middleman.
No and they will never be rare.
It does not have to be old at all. An error in the minting of a coin may make it rare. What may turn out to be a rare coin may have been minted in 2012, but nobody has found it and come forward with it yet.