Tommy Lynch, Operations Officer of the Fifth Fighter Command, USAAF, ( Pacific theatre) wrote a guide for fighter operations that was considered a 'bible', of sorts, in that theatre.. Though, for whatever reason, I can't find the book that it's in. He was flying P38s with Richard Bong at the time of his death after an attack mission against shipping.
He had a few instructions for those that flew under him:
1. Get rid of tracers. The enemy won't know you're shooting at him unless you hit him.
2. Never fly alone.
3. When leading your target, drag your gunsight through the tail of your target to the front .. this greatly increases your accuracy.
That's all I can remember, and if anybody does know where his guide is published, I'd like to get a hold of it.
Hope this helps!