While "Torah" usually refers to the five books of Moses or to the OT, it is correct that "Torah" means "instruction", which can include the NT. However, in Deuteronomy 13:4-5, God instructed His people that anyone who leads us away from obeying what God had commanded is a false prophet who is not speaking for God, even if they perform signs and wonders. So if you believe that the Apostles taught against obeying the Mosaic Law, then you are instructed by God to reject them as false prophets. The Jerusalem did not have more authority than God and they had no authority to countermand any of His commands, so they had no authority to tell Gentiles not to obey any of them, and if you think that they had tried to do so, then you should obey God instead. However, the Apostles never spoke against anyone obeying any of God's commands, but rather they continue to be Torah observant and to teach obedience to God's Law, so there is no need for you to reject them.
In Acts 17:11, the Bereans were praised because they diligently tested everything Paul said against OT Scripture to see if what he said was true, so if you believe that Paul taught against obeying God, then you understand him differently than the people who walked and talked with him. The NT authors quoted or alluded to the OT thousands of times in or to show that it supported what they said and that they didn't deviate from it. According to 2 Peter 3:15-17, Paul is difficult to understand, but those who are ignorant and unstable twist his words to their own destruction and fall into error of Lawlessness, so this is saying that if you interpret Paul as teaching against obeying God's Law, then you have misunderstood him.
The Mosaic Law is the way (
Exodus 18:20,
Deuteronomy 5:33,
Deuteronomy 8:6,
Deuteronomy 26:16-17,
Deuteronomy 28:9,
Isaiah 2:3,
Jeremiah 6:16-19,
Psalms 119:1,
Matthew 3:3,
Matthew 22:16), the truth (
Psalms 119:142,
Psalms 119:151,
John 17:17), and the life (
Proverbs 13:14,
Matthew 19:17,
Deuteronomy 30:15-20), Jesus is the way, the truth, and the life (
John 14:6), the Mosaic Law is God's Word, and Messiah is God's Word made flesh, so trying to separate following one from following the other will leave you with only half the truth.