At 8 weeks old, he needs to go out every 2-3 hours. He also needs to eat more frequently and of course have water all day accessible. You would not be able to take his food up yet and leave him home all day without food.
Do you have a friend or family member that can take him out while you are gone during the day?
Before moving and homeschooling my kids, I was a dog trainer with an emphasis on behavior modification. I used to write articles on training for the local paper back home as well.