Welcome!! Enjoy your stay here. He's a cutie.
One note, though, you *will* need a thermoSTAT to maintain the uth at a proper temp. Those things go crazy, and burn snakes, if they aren't hooked up to one.
http://www.amazon.com/Hydrofarm-MTPR...stat+hydrofarm
^^ That's the cheapest one on the market, and does a good job.
And no, he shouldn't be wet. I recommend picking up an Accurite indoor/outdoor thermometer/hydrometer. Walmart sells em cheap. Cypress mulch is pretty wet straight out of the bag, so you might think about taking it out and drying it in the sun for an hour or so. Humidity isn't a big deal unless they're in shed. In a tank setup, covering half of the top with plastic wrap or foil will hold plenty. Or you can just mist lightly once a day.
Have fun!!