I use a couple 10 gallons, and three 29 gallon tanks. I initially set up the hatch-lings in a 10 gallon, about 15 hatch-lings per 10 gallon. I purchase branch wreathes at the Dollar Store or Michaels. I wash them and then shred them into bramble that seems to be perfectly sized for hatch-lings. I also use schefflera that is small, I dont put the pots in because of size issues, I just use the freshly cut branches. No substrate, use paper towels since the chams wont be in those enclosures long. I setup temps about 10F degrees lower than adults, so around 75-80 basking, and 65-75 ambient. Mist several times daily and use Fruit Flies, about 15 flies each cham, daily. Day old crickets are also okay after a week or two.
At around one month, I separate the aggressive young-lings into a larger 29 gallon with small potted plants.
At around 2-3 months, they can no longer be kept together. I put them in separate mesh enclosures, 12X12X20 that I custom make. I usually sell out within a month locally.
Good luck OP, It is a bit of work so I avoid breeding as much as possible.