Dont get discouraged, especially if these were your first snakes. To be honest with you, I would never have recommended green snakes as first snakes. They stress out way too easy and are not a snake that can take handling. Pretty easy to go off feed and die. Being that they are an active snake, they feed daily or every other day on small insects.
If you still want to get into snakes, get yourself a colubrid. Get a king or rat and you wont be dissappointed. There are a ton of different morphs out there for the corn, black rat, texas rat and the various kings. They feed readily and are a hardy snake and once they reach juvenile, handling them does not stress them out!!
There are lots of different rat snakes and kings to choose from, and probably even a honduran or black milk snake would be okay for you.
Here is a pic of my everglades rat..

A pic of my albino black rat...

A pic of my KY locale black rat....He is right at 56"

And a pic of my male california king....He was 54" last time I measured him

So dont get discouraged and happy herping.
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1.0 Corn snake "Warpath" (KY locale)
1.0 Black rat snake "Havok" (KY locale)
1.1 Black rat snakes "Punisher and Mystique" (MO locale)
1.0 Eastern Yellow Belly racer "Nightcrawler" (MO locale)
1.0 Albino Black rat snake "Malakai" (Dwight Good stock)
1.0 Everglades rat snake "Deadpool" (Dwight Good stock)
0.1 Yellow rat snake "Rogue" (Dwight Good stock)
1.1 California king snake "Bandit and Moonstar" (Coastal phase)
1.0 Prairie king snake "Bishop" (KY locale)
0.1 Black king snake "Domino" (KY locale)
0.0.1 Eastern Milk snake "Cable" (KY locale)
0.0.1 Eastern/Red milk intergrade "Omega Red" (KY locale)
Good luck and Happy Herping
Brian