Just one tip. Do not level everyone equally. Focus on your best fighters. Just try to level then enough so that they do not succumb to 1 hit kills.
Satan said:
"You are for ever angry, all you care about is intelligence, but I repeat again that I would give away all this superstellar life, all the ranks and honours, simply to be transformed into the soul of a merchant's wife weighing eighteen stone and set candles at God's shrine."