Nancy, welcome to the forum. If you use
www.lugerforum.com you will see areas on the left you can click on, one is technical area and has take down instructions.
Mainly what you are looking for is the last two of the serial number on most parts.
A trick, the "take down lever", the part that looks like it can be rotated down on the left side, ENSURE you have the barrel pushed down on something or it won't start to turn and forcing it can break it off.
Taking apart is not as hard as sometimes putting it back together.
Also, prior to taking it apart, it was common for GI's to chrome or nickle their guns, if that has happened, then its value is only around $400-$600, so don't bother taking it apart. If "blued", then that is easier to tell.
ed