IMHO its very much worth to read the following at the numbered usaf historical studies page:
Operation SEA LION and the Role of the Luftwaffe in the Planned Invasion of England, by Karl Klee (1955).
http://afhra.maxwell.af.mil/numbered_studies/468155.pdf
http://afhra.maxwell.af.mil/numbered_studies/468156.pdf
Its a lot of text, but the German decisionmaking progress is very throughly covered, and during all the time the reluctance and hesitation is quite clear in the HC, especially that of Hitlers. One particularly interesting part from very early in the Battle, IIRC in July, where the records already show that perhaps it would be the best to prepeare the whole Seelöwe stuff in spring 1941. And, even during August, there was quite clearly no useable and detailed plan for an invasion, the navy and army still could not agree on the basic details.
Much has been written in the past nearly 70 years about the Battle, about the intents the progress made, but IMHO the real thing is how the German HC saw the matter back in the summer of 1940. And this is very well detailed in this study.