As any other player, you will start your Rivals journey in Division 10, immediately aiming to progress towards higher Ranks and Divisions while earning Weekly Rewards. At the start of each Season, progression resets to a lower Division for all players.
The Division a player rolls back to will depend on which Division finished the previous Season. From Elite to division 6, players have been relegated to two divisions, while players in divisions 7 and 8 are relegated to only one.