Most of the filmed episodes followed the original stories closely though some varied considerably. I believe there was one episode that combined two stories, but here is the list of stories not...
You have to buy them, they are not written weekly. They were all written in the 1800's Because they were written so long ago, the copyrights have expired.
Sir Arthur Conan Doyle the author did kill off Sherlock In the story, 'The Final Problem' But everyone was mad and unhappy with him, even Queen Victoria said she was mad at him killing him off, and...