There are plenty of online index guides and apps which can give you an idea of the value of your coin. The first thing you will need to know is the date and origin of the coin, and the condition of the coin. There are hundreds of coin collectors in the UK so it worth ringing round to obtain at least three quotes. Coins that were never used are called uncirculated. Try the Scarcity Index or Change Checker (both online) to find out the value of your coin. The Royal Mint is also a good source of inspiration and guidance for beginners.