And as previously stated, rough green snakes and keelbacks are going to come to you WC and in pretty shabby shape. I did see CB rough greens available once not too long ago but they went fast. Whether or not you have expierience with different species of herps is not the issue. The issue is that if you purchase a WC, unhealthy snake, such as these, 95% of the time, the snake will be dead within a few months, even with the most impeccable, immaculate, obsessive care. I personally have a TON of expierience with these typs of snakes in particular, and even for me, someone who can get even the pickiest snakes to eat and turn around into happy healthy snakes, have had to watch my keelbacks die without seemingly anything wrong outwardly with them. It really sucks to and is very discouraging when you are trying so hard to establish healthy individuals and produce quality CB specimens, and your adults which are doing SO well suddenly drop dead on you. It happens all too commonly. I say, go with a garter for a first snake, at least with that you stand a GREAT chance of having a happy healthy long term pet snake, instead of a slim to none chance. There are many many different species and subspecies of garter snakes. Depending on where you live some will be okay for you to keep, some won't. What state are you from?