Roll two 10-sided dice for an attack roll, then add your Ref and StreetFighting skill to the first roll, and if the first roll is a 10, add the second dice to that roll.
If the first dice is not a 10, then the second dice is the damage roll. If the first roll is a ten, then roll another 10-sided dice to determine damage.
Roll one 10-sided dice and add your Ref to that roll, this is your initiative for combat.