Q. Where can I find a character study on Sherlock Holmes?
You're quite lucky with this subject, not only because Sherlock Holmes is a great character to study, but also because there are many dedicated scholars of all things to do with this character out there who have made some excellent web sites. So have a look at these:
The next one has exactly what you're looking for, including a timeline:
Submitted by: jonny, (Age 14)
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A highly interactive Key Stage 3 English site designed specifically to meet the needs of En3 Writing, Spelling and Punctuation.
Way with Words
Write poetry with Benjamin Zephaniah. The fun site also contains word games and a useful glossary.