I believe the contents of the Mosaic commandments and the pattern of Torah-obedience, as laid down in the Pentateuch then amplified and exemplified throughout the remainder of Scripture, are the primary means of understanding the will of God for a community of disciples.
(That statement is a personal re-write of something Dr. Robbert A. Veen posed as a question in his book, The End of the Law?, published in 2005 by www.lulu.com.)