1917 Artillery Luger

[AKstranger]

I just bought my first luger the other day. its a 1917 artillery with all matching serial numbers except for the clip and stock( which i dont believe to be a original stock although it has a serial number on it as well). It is in really good shape and i got a great deal on it. Im hoping to make this gun last for generations as it has some sentimental value. My great grandfather fought in WW1 and one night spotted a candle light in no mans land. He went to check it out and found a German man reading the bible in his fox hole alone. he spoke to the man and said hed spare his life if he handed over his luger. Thanking my great g-pa he greatfully handed over the gun. Unfortunately that gun got lost over the years but this is the same year and model and it means a great deal to me. My main question is how should i care for the gun in order to make it last forever. I know how to clean guns and such but im concerned about the wood and also wondering what i should put on the metal to protect it.
Thanks a million