For airfields, this is the place to look:
http://www.ww2.dk/lwairfields.html
Here is a good (but not infallible) source for unit bases at different times:
http://www.ww2.dk/air/jagd/jg26.htm
And the "Fliegerhaus" (house of airmen?) could well be a mistake for "Fliegerhorst" (aerodrome).
For the early years of JG 26, I'd strongly recommend reading Donald Caldwell's "JG 26, Top Guns of the Luftwaffe".