Where can I find some primary sources about the sinking of the Titanic?
There are several places online where you can locate these types of sources. This guide from Christopher Newport University has links to several sites that contain primary source information about the Titanic, including 1912 newspapers, interviews, and correspondence of Titanic passengers.
Another source is books available in the library. A Night to Remember was originally published in 1955 and contains many interviews with survivors. Other books are available about the ship that cite first-hand experiences or original correspondence of passengers.