Nta so you generally want three staple feeders, example; Crickets, mealworms dubia roaches!
How much you feed depends on the age, babies we generally say as much as their eat within 15 minutes, Adults however usually only eat once to twice a week, limit about 5 feeders.
For a routine, again it depends on age. Babies eat everyday, while adults don't. Example my adults eat Tuesday and Thursday. Your adjust your supplementing with your schedule.
However, Do NOT buy from petsmart, petco ect. Those are mill babies and are bred for quantity not quality meaning its likely there could be health concerns going on as well as questionable genetics. Instead your should buy from a ethical breeder!