Make sure you get UNmedicated chick crumb for them, I usually mix it with water so it's kind of soupy, makes it easier for them to eat and swallow.
Mine start coming off heat in the day at about 2 weeks old and get put out in a run on the grass on warm days.
Sexing them can be done but you need to be shown how and be confident otherwise you can hurt them
As has been said a paint tray is good for water and they can drown easily so not too deep.
Good luck!!!