Astroturf makes good substrate and it works better than that reptile carpeting. Plus, your frog won't ingest it like he could other types.
You need to have foliage in there ... either real or fake. Real is good because it keeps up humidity levels but you can use fake as well ... you can collect branches from outside but you need to either soak them in a mild bleach solution or bake them in the oven before putting them in the aquarium to prevent parasites.
For heating you can use a 15 W bulb but it really isn't that necessary ... make sure you have a shallow water container in there for him.
Make sure you gut-load those crickets ... you can buy gut-load food at your
local pet store.