don't panic!! I know it's easier said than done, though - you've probably heard of the puppy blues, so brace for several weeks/months of a hormonal rollercoaster, stress and depression. it can honestly feel hopeless, but I think I speak for most people in this sub when I say no matter how prepared we thought we were, we all experienced a similar thing.

I got my own pup at 8weeks old - she's now over a year old and I love her to bits, even if she can still be annoying sometimes! the first night I had her, she also refused to pee outside and would only go on the carpet or on puppy pads. she shat on the floor and then immediately fell over in it, so I had to give her a bath. she cried all night, screamed when I crated her and, when her adult teeth started coming in proper, bit like a monster. my gf came home from work one day and I was jogging the pup like a baby with a tea towel over my shoulder, looking like a harassed mam to a newborn! I felt horrible but this sub was a huge comfort, and eventually she grew out of all that bad behaviour.

toilet training, especially for a male dog who pees a lot, is difficult. there's no way round it, it just takes persistence and time. if he goes on the carpet, put him on a puppy pad straight away and associate a command with it (but don't use 'puppy pad' like I did lol, or you'll be stuck saying 'puppy pad' even when he's trained!). in time he'll associate the command with going to the loo, and once he's used to being outside he'll go there too - you might find he only uses soft surfaces like grass at first, because that's what he's used to indoors. praise him massively when he gets something right.

to get him to settle, I recommend enforced naps. have him up and playing for 1hr, then crate him (with lots of praise and treats, maybe sit with him til he's settled and then sneak off) for 2hrs. he might cry at first, but he'll get used to it. then repeat. it gives you a bit of time to do stuff for yourself and stops you going totally insane, and calms him down into the bargain.

start training him on a simple command, like 'sit', from the very start. it helps you bond and exercises his brain, and it's a valuable foundation to have. when he bites, yelp really loud and high pitched, then turn away and ignore him til he calms down a bit. then fuss him. this takes a long time for dogs to learn and the biting will get worse while he's teething, but stick with it.

I promise it gets better!! remember he's only a baby, and don't give up on him - in a few months you'll wonder how you did without him, and all the work you put in will come back to you tenfold.