Check references, such as the Blue Book of Gun Values, Gun Trader's Guide. Check the price on on line auctions, such as auctionarms, gunbroker, or gunsamerica. Check with local dealers, or visit a gun show. Value with be based on condition of the firearm, but may be around $400-500.
Depending on EXACTLY what you have, a few hundred to multiple thousands of USD.
Impossible to answer without more information.
50-500 usd
You will need to contact Walther
No such sn used by Walther.
You will have to contact Walther to find out.
You will need to contact Walther.
The PPK/s is a PP with a PPK slide.
Impossible to answer without the serial number.
61-85, 100-1000 depending on specifics
You will can contact Walther, but probably 1943-45.
.32 caliber