The competition layout is demonstrated in the image below.
Wallers are paired up and are to compete against each other. The winner of each pair will proceed to the next round.
The highlighted blocks are for Round 1 and Round 2, so you know who you are grouped up with and possibly can face in the next round.
How are wallers paired up?
Entirely by chance. Your name will be written on a piece of paper or otherwise and drawn from a hat. You can watch the entire process in the Round 1 Draw video.