Here's a good link to get you started with your tank.
Your thermostat probe (the one that controls the heat source) goes outside the tank, between the bottom of the tank and your heat source, and your thermometer probe goes inside the tank over the heat source. You can really use any kind of UTH you want. I used a ZooMed one on one of my tubs for over a year (regulated with a Herpstat Basic) and an Ultratherm on the other (regulated with a Hydrofarm) for a little over a month, and both work just fine. If you have the money, though, I would go with the Herpstat for a thermostat. They're top-of-the-line. And the Ultratherm for a UTH, it's much more reliable than a ZooMed (or so I've heard)