So two questions:- In the first game round, initiative is decided by who has the lowest total value for their deployment zones. what happens if it's a draw?- Can you opponent challenge initiative during the first game round?
No, only for game rounds 2+.Page 10 of the Core Rules has it for your under Challenges to the initiative.
"In any round (besides the first)"
Roll the dice to see who goes first if first round initiative is a draw