what are the most important events in pip's life?how do each of them affect him?

Hey that would take up quite a big space. What would be beneficial is to take a look at the GradeSaver short summary. I'm also linking you with a timeline for Pip.

http://greatexpectationsjesseablock.blogspot.ca/2012/12/timeline-of-great-expectations.html

http://www.gradesaver.com/great-expectations/study-guide/short-summary/