Value is dependent on model and condition, and could not be answered without detailed information you have not provided.
for date of manufacture, contact customer service at Ruger.
http:/www.ruger-firearms.com
50-175 or so
50-200 USD
20-200 USD or so
Average $200-$300. Spelled Sturm BTW.
50-500 USD depending on specifics
500 or so
100-375 USD
50-125
500 USD each
A call to Ruger will get you the answer.
If you mean a Sturm Ruger, about 300 USD
0-300 USD depending on condition.