RAF Fighter Sqdn structure - 1940

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Please can anybody advise the RAF fighter squadron standard structure in 1940, I believe it was CO = S/Ldr, then "A" and "B" Flights led by a Flight Lt with each flight comprising 2 sections of three pilots/aircraft - so a total of 6 per flight (12 or 13 per squadron).

Did the S/Ldr lead one flight and a Flight Lt lead the other or would there be a Flight Lt for each flight of 6 aircraft plus the CO's aircraft.

Was there a standard where particular colours (such as Red or Yellow Section) were with a particular flight ?

Did squadron's have their own groundcrew or were they shared across the Wing? Did each squadron have its own Adjutant, Intell Officer, Engineering officer, etc ?

Thank you