I don't recommend heat lamps for cornsnakes. It's an extra expense to you, and they just don't need it.
For bedding, the two I see recommended the most often are shaved aspen bedding (from the rodent section) and eco-earth bedding. You can also use newspaper or repti-bark. I'm not sure about sawdust. As long as it's not out of cedar, it shouldn't be too bad.
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