You've got a couple of questions, so let's run down the list and try to hit them all;
1. Move and shoot and Razorwings - all your answers to that are functionally covered by Aerial Assault rules in the codex. In short, it can fire all weapons at Cruising speed and otherwise functions as a Fast Vehicle for firing weapons.
2. You don't make a roll to 'hit' per se' and you don't miss in conventional ways. The bombs use Large Blast Templates. All the relevant rules are on pg. 30 of the rulebook. You're really testing for scatter more than 'hitting' or 'missing'.
3. Yes, the missiles are each one use only - so after you fire them, regardless of the result of the shot, that missile is gone.
I think that covers everything, hope it helps.