It is really hard leaving the puppy for the first time. We have all been there.
I purchased a large play pen and kitted it out with all his toys and it even had room for his crate. This was perfect for him until he was 6 months old. We had one incident with the play pen, he decided to use his water bowl as a step and managed to climb out!!
I came home to him running around eating slippers
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He is 7 months old now and he has the kitchen and hallway to use now. We use baby gates to secure the area.
You are lucky that you have another dog to keep him company.
We also did a lot of practice leaving him. We would change the times we would leave him to make sure he knew we would always come back.
He seems fine with us going now as he knows when we go he gets a treat (filled kong).
I will always take him for a long walk before, in the hope he will rest whilst I am away.
You have to remember puppies need alot of rest and sleep, so you leaving him is not a bad thing. Just make sure the area is puppy proof.
He will be fine - especially with 30 toys!!
Let us know how he does