They will make a noise or whimper a lot and try to hold it and listen for those noises. This crate will be their safe place. Its their retreat place and sleeping quarters. If you have kids then they are to stay away from the crate. Sometimes they retreat their to have a rest from kids pulling on their tails, ears, etc.
Times are very important.
The puppy should be comfortable with you and the home. They should have their favorite blanket in their crate. Make the puppy stays in a certain area. If the breeder had newspapers down then you might have to put newspaper by the doorway for a few days. If the breeder was using an old vinyl floor then you could purchase a scrap piece and put it near the door or outside.