Whether opting for a personal study plan or for a small group or church-wide application, it begins with adopting a Scripture reading plan.
Believers need to immerse themselves in the WHOLE Word of God. In particular the truth is that the New Testament can never be fully understood without the foundation of the Old Testament. Jesus Himself used the whole of the Old Testament to explain to His disciples the meaning of everything He revealed in the New.
Then beginning with Moses and with all the prophets, He explained to them the things concerning Himself in all the Scriptures.
— Luke 24:27
In fact, labeling the two parts “Old” and “New” is a misnomer. If we had our way, we’d rename the Old Testament to “The Beginning”, the New Testament to “The Middle”, and include a blank page at the end titled “The End”. It’s really all one seamless, integrated whole.