Candyman, you really scored on that revolver! I haven't seen a four screw K-22 that nice. Should be a great shooter. Any standard or high velocity .22LR ammo is safe, just avoid the hyper-velocity stuff like Stingers. CCI Standard Velocity is a good place to start.

As for the SC of S&W - Amazon is the most likely place to find one these days. Warning-that book WILL help keep your wallet drained. Learning more about all the great S&W models leads to repeated adoptions into your family!