How do you prevent your German shepherd to dig holes and chew furniture?

So I plan on getting a puppy soon but I want to be prepared before I get it I don’t know if all dogs do this but I do know I heard dogs like to dig holes and chew furniture so I want to try to prevent that how do I do that?

If I put my puppy in dog training will that prevent that? I’m going to pay for obedience & protection in training.

My GSD is going to be a showline champion bloodline idk if that matters or not. It’s not a traditional German shepherd. Supposedly the person told me that the GSD I’m getting is known to be more calmer than the regular GSD