Hey glad to see people are still playing this game! Yes, you'll be combining the four aces and the 6 cards then add two cards on top to create a 12 card deck which you'll play with. You won't use the rest of the deck for this game. Both players should have their own 12 card decks.
I hadn't thought about restarting the game, but I suppose you could just mail the cards back to each other.
Let me know if anything's still unclear and thanks for playing!