If the functionality of the .32 PPK is similar to the newer .380s, then you can get a manual online for free here; Walther Amerca PPK Manual
On Gunbroker, there are a few things that might help you;
There is a book for sale that details the assembly/disassembly and maintenance of the PP and PPK. Its not the manual that would have come with the weapon, but it may be what you're looking for. PP Manual on Gunbroker
I did a quick search on gunbroker and came up with one item concerning magazines. More searches on your part may reveal some additional items for sale. $25 isn't bad for a mag, especially when you consider that they're asking $70+ for them at Earl's! .32 ACP PPK mag by MecGar
Thanks for your help. The online PPK manual at Walther America was really useful. I basically wanted to know how to field-strip and which parts they recommended lubing (or not). I'll keep my eye open on Ebay/Gunsamerica/Gunbroker etc. for mags and an original manual.
Walrus, if you can find your contact for mags that will make life a lot easier.
I like my PP so much I'm thinking of getting the Walther/S&W PPK in 32ACP too......sure beats a 22 for plinking, just wish the ammo wasn't so expensive !!