He needs a new uvb right away, the compact/coil ones are basically useless in most cases as they are almost entirely weak and dont provide any uvb on top of a mesh screen. And in most cases they also cause eye irritation, blindness and a few other things like mbd.
You can get a 30" or 22" one on amazon along with i believe a 34" or 24" fixture that must be reflective inside. Make sure to get a Reptisun T5 HO 10.0 tube light. Its pretty cheap on amazon and thats where i get most of my lights.
As for the commercial food its also pretty useless and should never be given as a staple, more of a "i dont have fresh veggies" kind of thing. It works for temporary food until you get actual food in most cases.
As for how many times he should eat and how many he should eat is a lot more than what they told you. Usually 3 times a day with 10-20 bugs each feeding, make sure to clean the bugs out before the lights go off.
Im guessing hes around 2 months so according to age this is what i do,
1-4 months 3 times a day 10-20 bugs each feeding, 4-12 months 2 times a day 10-20 bugs each feeding, 12-20 months once a day 10-20 bugs each feeding, 20+ months every other day or 2-3 times a week 10-20 bugs each feeding.
As for the supplements the calcium will work but you need multivitamins as well, i recommend getting repti-cal multivitamins without d3 added, offer calcium 5 times a week on at least one feeding of insects and multivitamins twice a week on at least one feeding of insects.
As for the temperature gauge if you have one that sticks onto the side and isnt digital you'll have to order a digital temperature gauge with a probe so you know the basking temp and not the air temp which is needed. Usually around 100-105 is a good basking temp with the cool side being around 70-80 and night time temps never dropping below 65.