Whenever you are trying to prepare a chapter summary, ask yourself, "What is the most important event in that chapter?" Once you've determined that, explain the What, Where, When, Who, and How of the event. This will lead to a developed summary.
As for giving you the summary for chapters 5 and 6, that will not help you in the long run. Read what eNotes has written, but then work it out on your own. Try my suggestions and you will see an improvement in your own response, not only for Of Mice and Men, but for anything you read in the future.