Fallow the link below.  What you will find is a biography of Salinger’s life. Read the information and free-write about anything that seems interesting to you about his life.
Keep in mind some possible connections between the character of Holden Caulfield and Salinger himself. If the topic continues to interest you outside of the website I have given, feel free to explore on your own more information about Salinger.  
 
 
http://www.notablebiographies.com/Ro-Sc/Salinger-J-D.html
About Me
NAME: Jerome David "J. D." Salinger
BIRTHDAY: January 1, 1919 (1919-01-01) (age 90)
INFLUENCES: Sherwood Anderson, Anton Chekhov, F. Scott Fitzgerald, Ernest Hemingway, Franz Kafka, Ring Lardner