Hi Austin.
You can check out the members galleries for some sample setup.
I'm not an expert but basicly darts don't need a ton of air so you tank will be covered mostly with glass and the light bulb you use will generate some heat.
Temps around 76 - 78 are good and nothing in the 80s for the day and you hoes ambient temp is usually fine for at night.
I use a compact florescent bulb so I don't generate heat on mine since my room is warm during the day.

Humidity needs to be high so routine misting over the day is needed.... I do mine twice a day.

The glass on top keeps the humidity up, the more you vent it the less humidity you have.

No undertank heater is needed. No water dish is needed since they absorb moisture through the skin.

Read a ton of care sheets and see what other people are using for plants in their setups from pics would be my suggestions.