One way to start is to make yourself a test field.
First lay down some cardboard in an area outside of the house to avoid false signals from the many different metal objects inside your house. Preferably in the backyard. Scan the ground to try to find an area that is free of metal. (No signals)
Now lay down a penny and scan. Record your reading on a piece of paper. Replace the penny with a nickel and scan. Record the reading. Remove the nickel and replace it with a dime. Then a quarter, then a half dollar. Make sure you identify and record each target and target I.D. number. The numbers you have recorded will be transferred to a white piece of cardboard that will be taped to the side of your detector or carried in your pocket for a quick reference. Do the same with silver coins and a few different pieces of Silver jewelry. (Ring, necklace, pendant, etc).
Now comes the fun part. Round up a few pieces of gold in different purities. (10kt, 14kt, &18kt.) (Rings, necklaces, pendants).
Also lay down a few pull tabs, pop tops, and some aluminum foil. Record each number. You will notice that some trash numbers may duplicate the gold numbers. Also, it should be noted that the signal strength can be amplified or decreased by soil moisture as well as the depth of the target. To further complicate matters, put a silver dime next to an iron nail. Listen rather than depending on the visual display of numbers.
There are numerous other little tricks but for now, high pitched signals may be Silver and low tones may be Gold. Good luck and happy hunting.