The frame carries the serial number, and must go through a dealer having a Federal Firearms License. Shipments between two individuals are prohibited. There are provisions for returning to the factory, a gunsmith or dealer, but not between two individuals. If you are still interested, seek out the advice of a dealer.
As far as the .32 Magnum is concerned, its a nice little cartridge, but unless you load your own ammo, not too good a choice. Factory ammunition is expensive, and you don't find "bargain" ammo as in .38 Special or 9mm. Its a great little cartridge in a Ruger Single Six, but strictly small game and varmints.