I bought a baby corn from South Mountian about 3 monts ago. Good choice, I know you will be pleased with your purchase.
You can get newborn pinky mice from most "real" pet stores. I started out with that, and then bought a bunch of frozen online because it is so much cheaper. I have found the corn really easy to care for. I have had various snakes in the past and the corn is very easy. Mine is growing nicely (she is just a "normal" corn, think I paid $20) and is quite pretty.
I use toilet paper tubes as hides, and shelf liner as a substrate. Most use aspen (and it works great), but I'm a clean freak and keep everything spotless and thats hard to do with aspen. I keep my Hognose and Corn on shelf liner and by Bearded Dragon on newspaper. The Dragon poops twice a day so its just easier for me to use newspaper.
I use a $15 drug store heating pad under the tank, and keep it on low. I have one that I have been using for eight years, and it still works fine. The under tank heaters made for reptiles I am sure would be better, but I just have never go around to using one. During the summer here in Texas I turn it off. I also use a small wattage light on my snakes for some heat and day/night cycle. On a small tank I use a cheap 25 watt from wal-mart. I do not use UVB lighting on my snakes, but do on my dragon. I keep a small bowl of fresh water in the cage at all times.
A cheap 10 gallon fish tank will work as a cage. I use reptile cages from herpcages.com and really like them. I have the 2 foot by 1 foot for my corn, and it seems a good fit. I like the front opening door, instead of having the reach in from the top.
More than anything else, relax and enjoy your snake. They are interesting creatures, and for me at least, fun to take care of.
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0.1 Western Hognose
1.0 Bearded Dragon
0.1 Common Corn