http://daedalus.umkc.edu/FirstGreekBook/JWW_FGB10.html
Now my question is in regard to the explanation for the Second Aorist.
1. How do I know that so and so verb doesn't have a First Aorist and such I must use a Second Aorist?The Second Aorist
91. Some verbs lack the first aorist. Such verbs often have a SECOND aorist, which ends in ον, and is conjugated exactly like the imperfect (69), as:
ἄγω, ἔξω, second aorist ἤγαγον, I led, ἤγαγες, you led, ἤγαγε, he led, etc.,
ἕχω, ἕξω, second aorist ἔσχον, Ι had, ἔσχες, you had,ἔσχε, he had, etc.
a The breathing of the future ἕξω is irregular.
The second aorist can be distinguished from the imperfect by the form of the stem. The imperfect is formed from the present stem (i.e. ἄγω), the aorist is formed from the aorist stem (i.e. ἤγαγον). From this point forward, the present, future and aorist forms of verbs will be given in the vocabulary and must be learned as part of the word.
2. I didn't understand the examples given up above. Is "ago" the first aorist and "ego" the second aorist, as with "Echo" the first and "Exo" the second aorist? Or "ago" and "ego" and "Echo" and "Exo" just the same and the words with the "ON" like "egagon" and "eschon" the Second Aorist words?