The Bible is one continuous story from front to back. It is not a collection of random stories.
Below is a document that will help you understand the 14 Periods or Eras of Bible History. There are several models out there to explain the Bible, but I like this one because it is well done and easy to understand.
Check out www.chronologicalbibleteaching.com
We have copies of the Chronological Study Bible from CBT in the back of the youth room if you are interested in having one.