I also had a wc garter a little less than a year ago - with a pretty much the same set-up... I used pine shavings as bedding (cheep and readily avalible) with some rocks for a hide, a fake plant, and a tupperware for the water. She fed on mostly minnows and earthworms, with a frog now and then - just things I got at the local bait shop... That's about all the input I can add though - everyone else has shared all my links. ^^;;
On the other hand, you have differnt fingers.