[patentnonsense]

The small o (omicron, the first one) as in "poke"
The big O (omega, the second one) as in "gosh"
The a as in father
the e is pretty short, maybe like the e in peg but more indistinct

All of the consonants are pretty much like American English.
(In modern Greek beta is pronounced as a v, but this was not the case in Classical Greek.)

Ancient Greek did not stress accents to the extent that we do; they had tonal inflections instead. However, those are so strange to our ears that (last I checked) most American classical scholars don't even try to reproduce the pitch inflections. However, I would incline to stress the second syllable of molOn slightly more than the first, and the first syllable of labe much more than the second.

Caveat: I did study pronunciation of ancient Greek when I was in college, but that was some time ago! Anyone who has more recent information on scholarly studies of pronunctiation, or who has scholarly information on the Spartan regional pronunciation, is welcome to correct the above. Anyone who is curious about the science of reconstructing ancient pronunciation (yes it is a science) might want to look at Sturtevant's Pronunciation of Greek and Latin or Allen's Vox Graeca (both still in print).