First, don't clean them, and try not to handle them Wrap them in toilet paper, and take it to a reputable coin dealer. There are a number of things that go into determining the value of a coin. The condition is extremely important. Mint marks, the initials stamped on the coin to determine what city it was minted in, the number of those coins minted that year, and the number still in existence are some of the things that have to be considerd. Aside from that, the value of a coin can't be determined without seeing it.