I just got my first chicks the middle of June. They will be 5 weeks on Friday, 27 of them. Love, love, love them!! I too was very nervous because of all the horror stories I was reading but so far so good. We will be putting them in the coop this week, so I am keeping my fingers crossed all goes well with the new digs!! I know they are safe inside the house so it scares me a little that we now have to start treating them as outside pets, which other than my horses I have never had.
I am sure you will do great and your children will love them!
As far as breeds, we got Silver Laced Wyandottes, Dominiques, Buff Orpingtons, EE's, White Crested Black Polish, Buff Laced Polish and Light Brahma's. That gave us a very good assortment of colors of eggs as well as the chickens themselves. All but the EE's and Polish are dual purpose for the most part so if we have any trouble makers or bad layers they will make for a pretty good dinner. They all should be ok during our winters and summers as well as being good layers, producing an egg every 24 to 36 hours for most give or take. We will see!!
Good luck with everything and definitely use this website for any questions or researching pretty much anything.
Post pics when you get them settled!!! PLEASE