Pretty easy, everyone had the rules in their head by the end of turn 1. Like xwing you move in ascending initiative order, then shoot in descending initiative order. All dice need 4+ to hit, with 6s being critical hits.
Thanks for that. I have a handful of 40k ruin bits and pieces which I'm putting back together. I also have the black reach box which, despite being full of ork sprues, only has 2 pairs of ork legs- so is kinda useless.