When two models with the ASF rule are fighting, they will strike in descending Initiative order, rolling a dice in case of same Initiative. All other factors, such as charging, great weapons, etc., are ignored, because they have already been bypassed by the ASF rule.

Ranged attacks normally target units and not individual models inside units, so the model using the breath weapon simply needs to see the target unit, not every model in the target unit. This is just to stop unscrupulous players to target units they cannot see (maybe by firing through a unit that stands in their way and blocks the view to the target!).

We cannot answer this question with an all-encompassing rule (as a few ruthless individuals out there would be sure to exploit it for their evil schemes!), but in three specific cases we can be more precise: hits from Flame Cannons, Warpfire Throwers and Salamanders' ranged attacks all count as Flaming Attacks.

This scores you a combat resolution score equal to the remaining wounds of the model slain. For example if a Lord level character (W3 on the profile), which had previously suffered a wound during the game, is then killed with a killing blow, it counts as two wounds towards the combat resolution score.

Each subsequent killing blow awards your side the remaining wounds of the model slain, as described above, to a maximum of +6. If the Lord in the example above suffered two killing blow wounds and one normal wound in a challenge, the enemy would score a total of +5 to its combat resolution score.

Yes, as long as no enemies can see them.