the very first day our puppy comes home...

I have a schedule and a routine but I haven't really thought about the first day. We'll be in the car with her for 2 and 1/2 hrs bringing her come. What do we do when she first enters the apt? Walk her around on a leash ? and begin crate training? It will probably be in the evening 6pm if this matters. Looking for the best way to handle, thanks.