They call this "Torah" or "The Torah," a Hebrew term meaning; teaching, instruction or law. Some call this loosely the law of God. See also the attached Related Link.
Reformed Judaism believes that the Bible is the main source for the rules of Judaism.
The Torah.
Those numbers are going to vary as accurate samples were not available at the time. However Judaism and Greek Mythology were the primary rules of the day.
The mitzvot (Torah-commands).
Israel.
Moses.
JUdaism
The Torah.
Example: There were many variations in the new rules.
See the attached Related Link.
Judaism was not "assembled". It came about through the rules established in the Torah, supported by the Prophets, and organized and expanded by the Rabbis.
Kashrut is the name for the system of rules for what food is kosher and what food is not. These rules include such things as a strict prohibition on the mixing of milk and meat (or things derived from milk and meat) in the same meal, rules for which animals may be eaten and how to slaughter them, and special rules that apply during Passover to products made with bread grains (wheat, oats, barley, rye, spelt) or that may be confused with bread grains.