As with any firearm, it is not possible to accurately appraise a gun without seeing it. Condition, and original configuration will determine value. Other factors such as rarity of caliber or guage and higher grades have significant impact on value. Recommend that you see a local gun dealer for an appraisal. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
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no history was kept on lugers
the frame
Any sporting goods store should have them
e-gunparts.com, gunbroker.com, or auctionarms.com might have them.
I luger is a type of pistol used by the German army during WW1.
I believe you will find that the German Luger P08 went into production in the early 1900's. P08 basically refers to Pistol of 1908.The luger was used extensively during WW1 and WW2 by German forces.
Well, WW 2 was not in 1915, but your Luger pistol may be worth anywhere from $100 to several thousand dollars, depending on the exact model, markings, and condition. There is no way to judge from the information in your question. The best estimate would come from a dealer that knows Luger pistols. If all else fails, see if the are some gun shows in your area- you should find several dealers that can give you an estimate of worth.
The 622VR is difficult to find. I have seen this pistol sell between $350 and $680.
You can find original Luger magazines at gun stores, online firearm retailers, auction websites, and from private sellers. It's important to verify the authenticity of the magazine and ensure it is compatible with your specific Luger model.
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There are dozens of variations of the Luger pistol. Without a LOT more information, I can only say between $400 and $1200 dollars. Value will also heavily depend on exact condition and originality. Please do NOT attempt to "clean up" a collector's firearm- that can destroy much of the value. You should find a dealer or collector that is experienced with Lugers for a first hand evaluation.