thats a nice setup, and a very cute garter snake too.
Corn snakes are as a rule very easy to keep, just a shame mine is very unpredictable. dont make the same mistake we did, make sure you get one from a good breeder,
we got ours from a reptile shop, they had no idea on the breeders background and knew nothing about how to keep corns either. it turned out that the corn snake we had bought had questionable parentage, being not quite fully corn. Drew is part corn and part black rat snake apparently some are bred that way to give them a little more bulk and length (although the results of that are questionable), instead it can make them quite unpredictable, Drew, whilst being a lovely snake to look at, is pretty much not a snake you can handle and be relaxed with. He can turn very quickly.
Good luck with your choice.