Their original plan was to have eternal peace after world domination and genociding away all other cultures. Many wars was really never the plan although in reality that would‘ve looked very different of course. You can‘t force a world order under one fascist regime for very long. People would have revolted constantly and the Nazis would‘ve tried to answer in the only way they knew how until the whole thing collapsed. It was doomed to fail but the plan really was long lasting peace after the one war, not endless wars.