What are the two main parts of the bible? how are tey related to each other?

The Bible is one book sent to us by God Himself. The theme of the book is the Kingdom of God. The beginning shows why we need that Kingdom and through out we see how the Creator made arrangements to bring this Government together. It show how Jesus will be the King of that Kingdom. We have divided it but it is one book and we see without the first part there is no reason for the second. Without the second we are left with no hope for salvation. They are definitely related to each other.