I don't know how people on here feel about him but I learned a lot about positive reinforcement training from Zac George on YouTube. He has hundreds of videos and they are free and in the 2 days my puppy has been home she will sit on command, looks at you when you call her name, and she started (last night) nosing her bells to go out.. these are her big achievements at 8 weeks! But it is WORK and I remember in your post about Wyatt's behavior issues, you didn't have adequate time to train him or play with him ( in the excessive amounts needed for a GSD) if memory serves me correctly? Do you have more time now that a few years have passed?
I am just curious because little puppy has me running all over the place keeping up with her and all the things she wants to chew and explore, then if I have her water bowl down, we have to go out every 20-30 mins whether she likes it or not so she isn't getting confused where pee happens. I guess my point is, no matter how free the information is you have to have the time to dedicate to training or you risk the same issues you had with Wyatt! You're gonna have to look at this as a part time job for a long while until your baby is a functioning adult. They don't know what we don't teach them!
With my pup, I literally have her on a leash 24/7 (except when she is playing with her KONG wobble feeder/toy) and she never leaves mine or my husbands side. Never. Not for a moment and if we can't be with her she's in the crate. She literally gets away with nothing right now. Except licking me in the face because I don't care if she does lol
"Whether you think you can or think you can't, either way, you are right"