Metal Detecting Guidelines:
1. Have permission from the landowner.
2. If you find anything of importance, take a photo with your phone (if your phone does locations) so you can record the GPS coordinates of the find, BEFORE you take it up or out of the ground. In fact, if possible or feasible, leave the artifact in place.
3. Contact a local historical society to see if you can establish the history of the location.
4. Contact your state or county archaeological group to have the find and location recorded.
The federal government, and your local state government have very specific guidelines about who owns historical finds, especially finds that are prehistoric or Native American in origin. So get with your local archaeological group - google it for your state or county - if you find anything important.