Where in your answer is there a citing of Christ departing from Scripture? Is it when you say, “...or did He teach orally?”
Isa 54:13 And all thy children shall be taught of the LORD; and great shall be the peace of thy children.
Is it when you say, “...did Christ come to establish a church?”
Deu 14:2 For thou art a holy people unto the LORD thy God, and the LORD hath chosen thee to be a peculiar people unto himself, above all the nations that are upon the earth. (though the word church is not used the word ecclesia — a special calling out/called out ones, the phrase referring to these called out ones “peculiar people” is the same phrase Peter uses to describe the church in his first epistle.)
As to the functioning of the church, is the servant greater than the master, or does s/he also (like the Son of Man) live by every word that proceeds from the mouth of God? Still waiting for you to identify where Christ departed from scripture in His life, choosing instead to go outside of scripture for direction.
Many of His acts may have been foretold in the Old Testament, but the actions of His life are a New Testament.