Make sure he has a place to soak if he wants, but that it's not so deep he can drown--they are terrible swimmers.
Keep moss out of the terrarium. It is a huge risk of impaction. Do NOT forget to switch out the substrate every month to two months, or your frog will likely become extremely ill. Bacteria builds up in the substrate and fungus can grow and infect your frog. It's not fun, and it kills quickly. Remember to condition the water you give him and the water used in the substrate/spray bottle to keep up humidity.
If he's buried--too cold? Too dry? full? stressed? Or just comfortable and happy? Keep an eye out for these reasons. Generally, they stay buried when not ready to eat, but be aware if they are buried for long periods of time that there may be something wrong.
These guys like it pretty warm. Don't put an undertank heater on the bottom of the tank, they will burrow down to escape heat if they think it's too warm, and will cook themselves. Heat should go on the top.
UVB light is debated whether or not it is needed. If you can, get a uvb light and let him soak in some rays at least a few hours a day.
Feed your crickets before feeding the frog. Don't forget to dust them with calcium, calcium with D3, and vitamins on a regular schedule.
Avoid excess handling, their skin absorbs toxins very easily.