airsmiles, don't worry about not knowing things as this is supposed to be the forum where people can ask any question without fear of ridicule. Everyone has to start learning somewhere and you will find that most people who post here will be willing to help. Occasionally there will be a sarcastic reply (such as the one above my retort) but just ignore them. You will also be provided with duff information by those who think they know everything but those who do know what they are talking about will soon sort things for you. There are some great, really helpful, very knowledgeable spotters who post on here and are also at spotting sites around the country. You don't say where you are located but three good sites are Prestwick, Manchester and Yeadon (Leeds - Bradford). I'm sure there are others but those are the three of which I have some knowledge.