All those who are justified, sanctified and glorified will live forever. I envision getting to this eternal state as involving a multistep process involving our lives both on earth and in heaven before we arrive at this final condition. The first step is justification in this life as we receive eternal spirits through the work of the Holy Spirit. Next there comes physical death when our physical body and living spirit are separated. Our bodies return to their elements. Our spirits go somewhere in the heavenly realm.
The completion of the process of our sanctification might be in a “purgatory” of the enjoyment of the presence of God. Perhaps this part takes place as we sing in the heavenly choirs and thus learn the truth about the Trinity and absorb what we need for our coming glorification. Frankly, I think instant total sanctification might be too much of a shock to our still earth-stained spirits at the time of our death and that there is a stage of spiritual growth necessary before we are ready to live as fully glorified people.
Glorification is when our sanctified spirits are joined to our resurrection bodies.
I believe we can know what our glorified bodies would be like were we to return to earth. We would be in bodies of such power that we would be as radiant as Jesus, Moses and Elijah were on the Mount of Transfiguration. We do not know what our bodies will be like when we go to live in the New Jerusalem.
When we fully exist in heaven we will be justified, sanctified and glorified. We also will be in the very presence of God so as to enjoy him forever. However, as to what our activities will be other than worship and celebration I find only hints in the Bible. Apparently, we must wait to find out about our eternal purposes, probably ones shaped in God’s mind before the creation of the earth.