how did he start his career?
Nolan started working as a script reader, camera operator, and director of corporate videos and industrial films.
Christopher Nolan
Nolan worked as a script reader, camera operator, and director of corporate videos and industrial films. 
when does the new dunkirk film come out 13 July 2017 what is the film about? It  depicts the Dunkirk evacuation of World War II. where was it filmed? Dunkirk, Dorset, United Kingdom, Rancho Palos Verdes, California, United States. who was the producer of the film? Christopher Nolan when was he born? Westminster, London
wiki:13513549
Christopher Nolan [SEP] 1970–1997: Early life and career beginnings
After earning his bachelor's degree in English literature in 1993, Nolan worked as a script reader, camera operator, and director of corporate videos and industrial films. In 1995, he began work on the short film "Larceny", which was filmed over a weekend in black and white with limited equipment and a small cast and crew. Funded by Nolan and shot with the society's equipment, it appeared at the Cambridge Film Festival in 1996 and is considered one of UCL's best shorts. He filmed a third short, "Doodlebug" (1997), about a man seemingly chasing an insect with his shoe, only to discover that it is a miniature of himself.