Hello Damocles.
My interpretation.
1 - At max limit of either ships sensor range try for detection (if only one ship has sensor range only one ship gets a roll).
2 - if detection works goto 3, if not continue to close one sensor range bracket until one side or the other or both detect a ship.
3 - after one side or maybe both detect, if only one side detects then only that side decides the range bracket if both sided detect the fastest ship decides the range bracket (they can close or open the range).
4 - if only one side detected then they get a free shot.
5 - combat continues until one surenders or escapes (remember that internals may slow a ship down ) just because a ship is fastest at the start of combat dosn't mean they keep the range setting for the whole combat it's decided every turn).
Firing of weapons is done by initiative order, so is maneuvering (using extra EP to dodge, jumping out or basicaly anything else).
This should work for one ship or a fleet.
Some Feats change the initiative for the ship or fleet for different things (check the HB) Tactics should change initiative for maneuvering and weapons.
Hope this helps.
Bye.
sock race.