If you have never done chickens before, I would get full grown chickens, if you can get your druthers, pick at least one or two from a breed that tends to go broody. Then later if she does go broody you can have your hen and chicks. Full grown hens are stronger, it is not uncommon to lose a few chicks at first.
I have got many hens that were full size, they start laying very quickly, and mine also figured out quickly that i was the bringer of food, so came running to me. They are friendly enough for me, but I don't like them jumping on me.
However, I do agree with the above, a group of hens will kill baby chicks, without THEIR mother to protect them.
MrsK