Well unfortunately what's done is done, so my best advice is to read through the forums on training a puppy. I would pay close attention to the topics of crate training, bite inhibition, and potty training. Because your pup has missed out on important socialization time with his litter mates, you need to work extra hard on socializing him.
Make sure to find yourself a vet and go get your pup checked out for a puppy wellness exam.
Buy a crate, put it in your bedroom, and crate train! Even if you eventually let the pup sleep outside the crate, crate train and get him used to a crate so that he has a safe place to go when you can't watch and provide supervision.
I'm not sure if you plan to feed kibble or raw, but find yourself a good quality food. There's a great website called www.doggoodadvisor.com
that does reviews of dog foods and rates them on a 5 star system. Whatever food you choose will have a feeding guide based on body weight, and you can decide how you want to split up that amount over the day. I generally feed breakfast, lunch, and dinner, though you can figure out what will work for your schedule.
Bring your puppy outside every 45 minutes to go potty, and be patient with him. It will take him a while to figure out where he's supposed to go. Look at his body language to try and determine signs of needing to go out. When he does go potty outside, praise and reward him. He will have accidents in the house, don't yell at him or rub his nose in it, just a quick "ah ah" and run him outside, when he finishes outside, praise and reward.
And a heads up, GSD's are a mouthy breed. Often lovingly called land sharks, they will nip and bite like crazy! Some days it will make you want to cry... Just remember, it will pass, and there is tooooons of great advice in the teaching bite inhibition thread.
The next time you're looking at bringing home a puppy, I know there is a thread here on how to choose a responsible breeder, and I would definitely encourage reading that. Good breeding stacks the odds in your favour in terms of getting a healthy dog with sound temperament.
Most of all, have fun with your pup, and welcome! This is a great place to learn!
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