The size of the crate is the most important thing you should only have a crate big enough for your dog to turn around and most puppies or dogs will not poop where they sleep also you muste take him out on regular potty breaks at night time just like you would have baby for feedingsy . Set an alarm and wake up two three times a night to go potty. Don't ignore his signals I need to go please make sure you take him outside and when he does go potty outside reward him not with Treats but with lots of love and telling him he's a good boy dogs thrive on our approval of them if you treat train him they expect treats every time they do anything for you. You may still have accidents on the way out the door from the crate to the door which is fine as long as he's going towards the door whenever he Has an accident be sure to tell him no and probably outside if you can pick him up and take him outside as his going potty once he plays outside of course reward him him again with good boy good boy and petting him and loving him . Always have a specific command that you use for each type of training such as"potty outside" and every time that he does go potty outside make sure you are praising to the point to where he feels like he's doing the most amazing thing in the whole world he could ever do trust me he'll get it. But first and foremost to make sure that you're great is not too big he should only have enough room to turn around in it and that's it. And always listen to his signals that he wants to go out. I hope this helps