Hi and welcome to BYC - glad to have you join us. There's lots of info in the Learning Centre and if you wish to meet up with other members local to you, you can join your state thread. Treats are fine (but keep them to a minimum) but its good to give your chicks access to grit so they can process food properly. If you let them outdoors, then they will get what they need from soil etc. Alternatively, throw a sod of grass (soil an all) into the brooder.
All the best
CT