I can either E-mail you some useful material either signal interesting WEB sites which have valuable works on the ancient Greeek language.
Anyhow I inform you that Germans philologosts of the XIX yearhundert, such as Th. Mommsen, Wilamowitz-Moellendorf, R. Kuhner, H. Bonitz and many others, have been really outstanding in theirs studies on ancient Greek. To read them you must be able to understand both German and Latin. They wrote extensively also in Latin.
If you are interested you can freely E.mail me.