I can tell you how I do it, because it makes sense.
teams select characters.
Decide which team goes first (I do this by rolling a die for each character and adding the team scores and comparing)
Then Team A chooses who will go first, that character selects powers and rolls movement.
Team B chooses who will go second, that character selects powers and rolls movement.
repeat till all characters have 2 powers and movement rolled.
Then starting back at the first character, start placing characters.
Since the order is the same as in game the first player's disadvantage at having everyone know their starting placement and powers offsets their geting to change powers and act first.