David has a lot recorded of his life and if you plan to teach everything, this lesson is divided into two parts; unless you have a lot of time or want to condense the information for a shorter time frame.
Saul was the first king of Israel, but his disobedience to God caused him to lose the kingdom. David is briefly discussed, but this lesson is an overview of King Saul. His son Jonathan is not mentioned and his information is in the next lesson. David's life is after Jonathan.