I'd have 25day old (10mm long) crickets (at least 300) on hand (for starters (or similar sized roaches) and be feeding these lots of quality high calcium greens , repcal adult beardie pellets (straight from the bottle) and carrot chunks (food and
hydration).
I'd also try to get phoenix worms (BSL maggots) and small silkworms (about 1-1.5in long) these don't need calcium dusting to give for at least one of the three daily live insect meals.
I'd also offer grated root veg (carrot, sweet potato) and chopped greens daily from the getgo.
I suggest setting each of them up in a rearing tub (about 100 LITRES in capacity with clear see though sides and clip on lids) to get then started , I raise all my young lizards in 100L rearing tubs for their first 12 months or so , then upgrade them to full size enclosures (4ft x 2ft is recommended for a single adult central beardie).
Tubs are very easy to convert to rearing tubs, all you need is a soldering iron and a power drill and maybe some cloth tape.