We use a 100 gallon stock tank in our garage for the first two weeks, so they develop protection from the Marek's vaccinations given at the hatchery. Then, out to the coop section set up for them, with the brooder plate in one side, so again, plenty of space to run around and get comfortable at...
Have a thermometer set under the heat lamp, or under the brooder plate, at least the night before you get those chicks, so you can adjust things to be right for them.
They will be fine in the box from the store as long as your car is warmed up.
Make sure you know what chicks of different breeds...