P1E, a good start is looking at an online shop and checking the markers, air tanks, hoppers and their names. Gives you an idea of what people are talking about (generaly).
Another place for some information, is check the "For Sale" forum looking for people selling their markers. They will say what marker it is and should have some pics. So if someone is selling an "ion", check the pic and see what an Ion is. Then can google it and check some reviews on it, get an understanding of what it is and what features it has... its made by Smart Parts btw.
Go through the range of kit, and get an understanding of the lingo