Get yourself an A-Z of your nearby area from a bookstore, start looking where streams vanish on the map pages, mark the relevant pages, and go and check out the locations, it might be nothing, but it might be something big. Good, waterproof, comfortable and protective footwear is a must. Obviously the old draining adage, no drains when it rains, let someone know where you are going, and do not go alone until you feel comfortable enough or safe enough to do so, everyone has their own view, but I think it is always better to go draining with at least one friend. If at first you don't succeed, or something is not as big or impressive as you like, don't worry, you will discover bigger and more impressive drains, and will be glad you stuck with it. Just start local and see what you turn up, before you worry about moving on to other cities or towns to find more, and have fun, enjoy what you discover and see. Hope it all goes well, and lots of articles on here, and people who I am sure will be happy to answer PM's.