He began writing short stories (says Wikipedia) while at university studying to become a doctor, so some time in his university career from 1876 and 1881. We know his first short story appeared before he was 20, so that narrows it down to between September of 1876 and May of 1879.
According to this biography at the link below, he attended university with a number of people who would become famous authors, and "a couple of years" into his studies he wrote a short story. His first short story sold (don't expect that if you write), so the story mentioned in Wikipedia was his first. Because they also give the date of his first publication--1879--and Wikipedia says it was published before his birthday, he probably began writing fiction in 1878.
He was bored of waiting for his medical patients to come. He was 20 when the first of his stories was published, 'The Mystery of Sassasa Valley (1879).
Yes, Sir Arthur Conan Doyle was a freemason.
The cast of Sir Arthur Conan Doyle - 1929 includes: Arthur Conan Doyle as himself
Sir Arthur Conan Doyle's assistant for 40 years was Major Alfred Wood who wrote many of the Conan Doyle manuscripts. Sometimes Conan Doyle himself or others would write them, but I do not believe they were ever typewritten.
Sir Arthur Conan Doyle was born on May 22, 1859.
The answer is: Sir Arthur Conan Doyle! Most people should know that!
Sir Arthur Conan Doyle never travelled to India.
Observation, logic, deduction and diagnosis was the formula with which Arthur Conan Doyle wrote his detective stories.
The duration of Sir Arthur Conan Doyle's The Lost World is 2640.0 seconds.
Sir Arthur Conan Doyle's The Lost World was created in 1999-02.
Sir Arthur Conan Doyle stood for election as a Member of Parliament, twice, but was not elected.
Sir Arthur Conan Doyle's The Lost World ended on 2002-05-13.
Sir Arthur Ignatius Conan Doyle. By the way, it is not proper to refer to him as Doyle or Arthur C. Doyle.