Congratulations!
There was a thread where we discussed the Greek grammars (there is one
on Perseus which is digitized... ).
Big Liddell-Scott is then either on Perseus or (which is better) via the program (=ergo an offline solution) that is called "
The Diogenes Project" which contains in its basic form digitized L&S and Liddell & Scott.
I suppose you have already chosen some method/some learning curve? Or maybe you just plan to read the grammar book
(Edit: I see... the corespondence course - hmm, good luck I guess you are sure now that you can expect from that some results)
You would probably like Latin-Greek and Greek-Latin dictionaries? They are on
my site along with the instructions how to type Greek there (via Latin). You can get them also from Quasus (his solution), but I have repaired since then many inaccuracies in the search that resulted in a wrong page coming... so the search should be quite 100% per my site.
On the same place there is also a Greek etymological dictionary (however published some time around 1850 when the IndoEuropean studies were just in their beginning... so you won't get there that kind of information you could with a potential modern etymological dictionary of Greek: like reconstructed Proto-IndoEuropean roots and so on).
You can also see that having searched one word in one dictionary, you can easily switch in the top corner to another dictionary to search the same word there.
There is also a thread in the Other-languages section that deals with an easy method of writing Greek without changing settings in your Windows and having to deal with a foreign and not very user-friendly keyboard layout.
(Other dictionaries/tools that aim to make it easier for one to get some fluent command of the written languages are being evolved )
Oh, btw we are talking the Attic Greek right? ) (that would be funny if the course came with the modern Greek - well you would be able like that to expect a very quick progress since it is a living language).