Assuming you're new at this, start with books. Find books on shipwrecks in an area you're interested in. Look on Google Books or your local library for popular books. Once you scour the books and find interesting wrecks, make a list. Then go back to the library and find more info on your targeted wrecks. While not always the case, going to a library or archive is essential in verifying wrecks found in books. Most treasure wrecks found in books are worthless, but you have to check and see. You can find unpublished wrecks, but it takes knowing the ropes to get to that point. Of course, you can skip research and simply ask local fishermen and lobster divers if they know any interesting wrecks in the area. Then you can work backwards from the artifacts you may find. Good luck.