The exposition of the story Of Mice and Men starts out when Lennie and George, the main characters spend their first night just a little ways from the ranch at the lake.
The inciting incident of the story is when George tells Candy about the incident in Weed with Lennie and the girl and why they had to flee.
The farm, will we still go? Without Lennie?
The rising action in the book is when Lennie strangles his new puppy to death because it bit him, just like all the mice Lennie killed, but then he worries that George won't let him tend the rabbits anymore.
The climax of the story is right when Lennie has Curley's wife in her arms and is strangling her after she took advantage of him while he was in a fragile state. After the dog, and now this, at this point you also realize Lennie's fate.
After the climax comes the falling action where Curley and Candy find Curley's wife dead in the barn house, and they wonder what happened to her, and who did it.
The resolution, even though it is not a happy ending it is the best and easiest choice for Lennie. George shoots him in the back of the head fast and painless before Curley finds him and does his worst.