Meat chickens drink a lot of water….lots and lots, so make sure they have plenty and you are checking it to make sure they don’t run out.
Do you show individual chickens or a pair? If a pair, they usually are required to match in the sense they are same size, etc. so you need more chickens to get the best pair.
Some may die as chicks, so buy more than you need/expect 1-2 to die. We usually have 1-2 (out of 16-24 meat chickens) to die.
Buy day olds that you can pick up in person and immediately give them food and water. I have read an article indicating meat chickens that are shipped/don’t eat feed until day 3, never quite catch up to ones fed more quickly. We drive to pick up ours, we bring them home and spend an hour inside getting them all out, checking them over, making them drink water*, dosing them with a drop of poultry vitamins**, and dropping feed crumbles for them to begin to eat. We watch them (a few at a time) for a few min to see if any issues like leg issues, or lethargic behavior. Once this is done they go to the brooder.
Meat chicks need heat, but they also need to be able to get away from it too. They seem to overheat much easier than a regular chick.
* Drink water: we cut down some plastic cups and hold the chick and dip their beak in. They need to put their head up to drink, so we dip them put them upright, still holding them, and dip again once they swallow. When we put them down, the cups are short enough for them to drink on their own.
** vitamins: we use Nutri Drench. It’s a poultry vitamin, and we use a toothpick to get a small drop, then touch it to their beak, where it runs in and they swallow. If you do not want to buy the vitamins, it is not required- we have them bc we raise other chicks too.
Note on additive water: sometimes people say to use Apple Cider vinegar, or electrolytes etc. If you do that, that is fine, but ALWAYS offer plain, additive-free, water too.