You need to ask a gunsmith for assistance.
Sterling
Sterling has not been in production for many years. They are no longer available through normal channels.
35-100 dollars
5 and 10 shot
Best left to a gunsmith.
The exact value of a 1912 32 Remington rifle depends on a couple different things. Most importantly the condition of the rifle.
try egunparts
580mm, or 22.83 inches. Rather long barrel for a .22 rifle.
5-125 USD or so
22 Long Rifle
It replaced the smoothbore musket.
Sterling of England was purchased by Benjamin air gun co in 1994 (After Crosman purchased Benjamin) The Sterling line was discontinued. The HR81 came in calibers of .177, 20 and .22. if fired at a speed of 700/600 FPS. Unfortunately you did not state the current condition of the rifle so I can not give you an estimate of value.