What is the correct sequence for setting up and starting a 1v1 game in Riftbound?

Ruling: Players reveal legends and champions first, then select battlefields (simultaneously in best of 3, randomly in best of 1), determine turn order, draw 4 cards, mulligan up to 2 cards in turn order, then the first player begins their turn.

Sequence:

• Each player reveals legend and chosen champion
• Each player selects a battlefield (in best of 3: set aside chosen battlefield and reveal simultaneously once both decided; in best of 1: select randomly)
• Determine turn order (typically roll dice, winner chooses to go first or second)
• Draw 4 cards
• In turn order, mulligan up to 2 cards (recycle them and draw as many as recycled)
• First player takes their first turn

Nuances:

• In best of 3 matches, after the first game you cannot choose a battlefield used in a previous game of that match
• Each subsequent game in a best of 3 requires selecting one of your remaining unused battlefields