Hello and welcome to FF! Well, first thing to do is read the ground toad care article: Frog Forum - Toad Basics - Keeping ground-dwelling Toads. A care sheet for Bufo, Anaxyrus, Spea, Scaphiopus, Ollotis, Alytes, Pelobates. In there you will learn how to set-up an adequate enclosure and provide proper care for them. For feeding most toads, you want food size that is around the distance between it's eyes. For very small toadlets, wingless fruit flies available in pet shops are good. A vial of fresh culture should feed them for a few days until they get a bit bigger. From there you would feed pinhead crickets, then small crickets, etc. Problem with using collected food from the wild is the possible presence of chemicals like pesticides and/or parasites.
Need to get (among other things) calcium and vitamin supplements available at pet shop reptile section (Repashy and RepCal are good products). Dust the food (in plastic sandwich bag or similar) by dropping a pinch of powder, fruit flies or crickets, and shaking them around for a few seconds until insects are well covered. Dust with calcium 2X and vitamins 1X weekly on different days with skip day in between.
Only use dechlorinated water (Exo Terra Aquatize or Seachem Prime are good) in shallow water dish for a water bath that will only get to toad's chin. Hope this get's you started and good luck!