JohnB, welcome, I am on the other side of the state!
There are other forums, but this one probably has almost everything you need [img]biggrin.gif[/img] and is specifically on Lugers, although I also go to other forums and enjoy them also, [img]wink.gif[/img]
Anyway, on your left (provided you came into
www.lugerforum.com ) is Techical and General Information. Here you can research and learn.
Also, you can do "searches" for information, there have been several write ups on Luger Books, parts, markings, years etc.
Several are very specific, but if I was you, I would look for Jan C. Stills Imperial Lugers, it is excellent and has specific info on WW1 Lugers.
Ed