Chinese is one of the most popular mantids here apart from gongy it seems so there are many topics to look at, but in summary...
In my opinion, feed on fruit flies until they look like they've outgrown them - after the second or third moult should be fine - you can feed them beyond that but it will just take a LOT more fruit flies - I figure it to be about 2-3 times as many as the last instar could eat (1st = 1 or 2, 2nd = 2 to 4, 3rd = 4 to 8)
Moult time is roughly about 2-3 weeks per moult... My newborns took about 15 days, and some about 20 days later still haven't gone...
Best advice from me is to make sure there's at least some humidity... they seem to be working well for me just in the washer room (so a little humidity) but at least 5 have got their legs caught in their sheds due to humidity (or just bad luck) - salvaged a few though by helping once the skin is dry but it's fiddly...
And if you plan on keeping about 20-30 as I am... make sure you have a feeding/ watering/ shedding rota... it really helps to know when they shed last, when they were fed last etc- because they all do it at different times
