Hello and welcome to FF! Amy pretty much has you well covered. Crickets should be same or smaller than distance between frog's eyes. You can place dusted crickets in a small glass bowl and they will stay in it. Start with a couple and eventually the frog will learn to eat from there. It's easier to monitor what they eat that way. Uneaten crickets should be removed from enclosure in the morning; otherwise they stress the frog and could bite it. Gut load crickets with lettuce, carrots and cherios or dry cricket food. Supplements should be used; more info in here: http://www.frogforum.net/food-feeder...schedules.html.

If going back with substrate, it should be mixed with dechlorinated water (Seachem Prime or ExoTerra Aquatize will neutralize heavy metals in well water) until slightly damp and clumps in fist without dripping water out. Hope this helps and good luck !