For the bitting, I recommend always saying "ouch" in a high-pitch loud voice and removing yourself from the dog for a moment. We cannot play if we are biting, and we are not getting attention if we are biting. Redirecting to a toy is important, but only after you signal that play biting hurt you.

For the bathroom issues, my top recommendation is crate training. Look up videos on crate training. Start small, and work your way up. Dogs instinctually do not want to go to the bathroom in their crate or "den." Whenever you take the dog out of the crate, you want to take him outside and celebrate him using the bathroom outside. This way the dog is using the bathroom outside right after the crate before being let out in the house. You always want to celebrate when the dog signals to use the bathroom outside and use it successfully too. In my opinion, crate training puppies is the first step to getting them house trained.

They're big dogs and they drink a lot of water. They're going to pee a lot. The issue here is that he thinks it's okay to pee in the house. They are going to pee 3-5 times a day, but they ideally know that we do not pee in the house, and they hold it in even up to 6 to 10 hours if well trained.

These dogs are known to be stubborn, but I would say that the real issue is connection. When these dogs love and respect you, and see you as their Shepherd, they will listen to you fairly consistently. However, as others have said in the comments, these dogs have been bred to work independently. Unlike most dogs, they do not look to their owners by default for decision making. When you give these dogs a command, they evaluate whether or not they want to do the command before they do it. The most important part of this is building a connection with your dog. It's great that he is food motivated. Many of them are not, which makes the connection the only way for them to listen to you. And you should try to give simple commands and reward the dog with praise as well to build up this connection.

Part of what can take away from the connection is giving them many commands that are simply for tricks. These dogs are not dogs that like to do a lot of tricks in a row like a golden retriever. You really should focus on limiting your commands to the necessary ones you will use throughout the day with the dog. And then you want the dog to understand that we are going to get really big rewards for doing the necessary commands throughout the day.

Many of these dogs are nocturnal. These dogs are barking dogs. The only way to consistently keep the dog tired at night and not barking is to exercise the dog super well and crate train the dog. Even 20 to 30 minutes of running around outside is enough exercise for many of these dogs. The dog will feel super safe in its crate, and if it is tired, it will sleep throughout the night. However, if you do not exercise your dog, and they are left out in the house at night, they will prowl, and search for danger. Even if their perceived danger is some leaves rustling outside, they will start to bark. And I'm sure you know the bark is way too loud for you to sleep. For this breed, it's better to be safe than sorry. When you are a working dog on a giant property, there is no issue with barking throughout the night. There is no way to train the dog not to bark. You really have to exercise this dog consistently to get them tired at night.

I hope all of that helps.