2 Timothy 3:16-17, "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, throughly furnished unto all good works."
We don't need to know exactly what happens when we die aside from what the Bible tells us because if we do as the Bible says, we have no fear of it. We are given no sanction to say "what if," neither in our personal decision nor our urgency for the decision of others.
The "man of God" referred to here is priests. Scripture is God's Word, no doubt about that. But the Bible doesn't tell us what books constitute the canon of Scripture, the Church does. The Bible calls the Church the "pillar and foundation of truth."
Regardless, this passage can't be referring to the New Testament because the New Testament simply didn't exist when this passage was written. The New Testament canon wasn't finally settled until around the year 400.
we're not told everything. But everything we NEED to know is there.