It's not ideal to leave such a young puppy for so long - but if it can't be avoided you need to think "Puppy".
I used a puppy play pen for mine and put some paper to pee on, their bed, some fresh water, and a kong filled with their food mixed with yogurt and frozen so it lasts longer, the radio or tv left on low.
If you don't have a play pen get down on the floor and see if there is anything he could chew, cables etc or holes he could get stuck in and check any toys for bits being chewed off.
have you left him for short periods before?
He'll probably cry as he does at night for a short while then give up and go to sleep, don't make a fuss when you leave.
As long as you check everything is safe he'll be fine
