Unfortunately, I think most of your problems are stemming from you pup's age. Most breeders won't let a puppy go to its new home until it's at least 8 weeks old and some won't part with a puppy until it's 10-12 weeks. Think about it this way: your six week old is an infant dog. Treat it the way you would treat an infant child. He'll want to be with you ALWAYS. He is too young to be separated from his litter, so you're now his litter. You can work with him on house-training but most of the work is going to be yours. He can't hold his bladder for more than an hour or so once he decides he has to go, so take him out very regularly (every 2-3 hours) and praise him like crazy when he goes. By the time he's 8 weeks, he should be up to every 4 hours. By the time he's 12 weeks, he should be able to sleep through the night without going out. Luckily, ridgebacks are very clever dogs and he will pick up on how pleased you are when he potties outside, but he is WAY too young to understand being yelled at when he has accidents inside (which he will do), so no yelling. Yelling is for dogs who are fully house-trained and should know better. (Mine have NEVER had an accident since they were house-trained that wasn't related to an illness, so I don't expect you'll be yelling too much about house accidents.)
No obedience training yet. Work on house-training for now. When he's 8-10 weeks, you can start working on other things like gently encouraging sit and stay.
One thing to watch for is bite inhibition. Bite inhibition is taught by momma dogs and that training continues til about 10-12 weeks. He will be mouthy with you because he doesn't know better. If he bites too hard, yell, "OUCH!" and get up and walk away from him for a few minutes (like, 3; not 10 or 20). He will learn that when he bites down, fun stops, and he'll quit. That's as much punishment as he needs.
You may find that when you crate him at night, he beds down better if you sleep next to the crate. Remember that he's a baby and a social creature. He's NEVER slept without touching one of his littermates or his mom. Once he gets older, you can move off the floor and expect him to sleep through the night.
Please ask lots of questions.
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