Check out this free booklet available through the Bible Sabbath Association!
A Beginner’s Guide to the Sabbath
This booklet lays out the fundamental understanding concerning the Sabbath such as “When is the Sabbath?” and Biblical reasons to observe this special day. It includes practical knowledge such as how to observe the Sabbath and ways to get off of work on the day. Lastly, it includes charts that list all references in the Old and New Testaments to the Sabbath.