Welcome to the forum!
Just one!!!!
Well, I must warn you that will not be easy, this hobby is pretty addicting.
It is a very complicated hobby, so I do suggest you indulge in buying some books, this way you can really enjoy all the variations, it will also be away to getting the "one" Luger your after without buying several to get there.
Good luck one that!
again
Welcome to the forum!
Vern