Since Luca was 11 weeks olds we would have to leave him home while we went to work so he is accustomed to it now. From what I can tell he just goes into his crate and sleeps most of the day away. We always leave the TV on for him so he's not sitting in silence.
Your pup will very likely be upset about it at first. That's unavoidable. I would leave something in the crate that has your scent on it like an old shirt so as to comfort him.