Nubbynub, welcome to the forum. I am new to Luger ownership as well. You came to the right place.
As mentioned above read the FAQ section as there is a wealth of info there. The name should be changed from FAQ to ELFI (Essential Luger Facts and Information). Yes, I like ELFI better. It even sounds cool.
What magazines came with the gun? Pics of the mags, particularly the bottoms will be helpful.
I am sure you will enjoy your new to you Luger very much. This hobby is addicting.