Gathering information of Squadrons and their airfields

[SNAFU]

Hi all,

For some time now, I am trying to find as many information possible on which squadron operated at what time from what airfield. I am facing more difficulties than expected and hope to get some more information here. Maybe the experts can help me bit for the time frame June to October 1940 for allied squadrons and german "Gruppen" - fighter, bomber, CAS and heavy fighter, all information welcome.

Thanks
SNAFU