A team determined at random chooses either to play first or to play second. The choice must be made before either player on that team looks at their hand. If either player on that team looks at their hand before their choice is made, that team plays first. The team who plays first skips the draw step of their first turn.
This should just be a rewording of the regular matches’ Play-Draw Rule with the word “player” replaced with “team”. All that is missing is the two paragraphs dealing with game two and three. If a game two is happening because game one ended in a draw do feel free to refer to the regular rules in section 2.2 for how that works.