Is this a new thing or has he been doing it since you brought him home?
Diapers I think would only put a band aid on the real issue, which is what you are trying to figure out.

For now I would close him off in the kitchen it will be the easiest to clean up after him. Remember not to punish for peeing in house unless you catch him in the act. If you do catch him in the act say NO and take him outside right away. If he finishes outside lots of praise.

Crate training is going to take some time, that is why I suggested giving access to only one room while you train the crate. It will probably take a few weeks before you can leave him in the crate all day while you are gone or at night.

I can help you with crate training steps or you can do a search online.
Good luck.
Gina