While it is true that Holy Writ is a book of progressive revelation, insofar that, as we proceed through its pages, we discover more and more light and understanding of our great YahShua, and we also find more and more precepts to protect us from the rising decay of this present, godless world. Where sin abounds, grace (the ability to keep the Law - Titus 2) abounds even more.
However, the beautiful and intricate tessellation of Torah is woven through the entire Bible, from the very beginning to the very end.
Did the Torah really begin at Moshe, after over two thousand years of earth's history?
No, the TORAH WAS FIRST GIVEN TO ADAM. We know, for example, Adam understood that from friday sundown to saturday sundown, he was to rest and relax. The shabbat commandment, at the very least, was established from the very beginning according to Genesis.
We know, from the story of Noah, that the dietary laws of Torah were already understood. After all, Noah was told by Yah to place 7 of every clean animal and 2 of every unclean animal in the ark. This is amazing since before the Flood, mankind did not even eat meat at all. Yet they still had the dietary laws regarding meat found in Leviticus 11, otherwise how would Noah distinguish between clean and unclean animals?
In the days of Avraham, we know that he walked in all the laws, statutes and commandments of YHVH, for this is what Genesis declares. The Torah had been revealed to Avraham. In fact, the law of offerings and sacrifices, the law of giving, were found in not only the many men who killed animals and offered them to Yah, but also in Avraham's exchange with the High Priest of Shalem (Yerushalyim).
Finally, in the days of Moshe, Yah had to REMIND planet earth of all the laws and statutes which they had forgotten due to the sin and darkness that had descended on the earth since the time of the Flood.
Make no mistake about it, the Torah is as old as YHVH HImself -- it has no beginning and it has no end.
His Law -- His very Word, ENDURES FOREVER.