@littlebilliie I agree with the others to sleep with pup especially at the beginning. They are like tiny babies and have been taken from everything they know and probably slept with mum and siblings for all their life so far.
Either have a crate up next to your bed so you can drop a soothing hand in, or sleep downstairs next to crate. We slept downstairs next to crate initially, leaving door open. PoirotPup would mostly stay in crate but sometimes came out and curled up next to us.
We now sleep upstairs and him downstairs and have baby monitor/video cam to check on him. If he has ever whimpered we’ve gone straight down so he knows he can ‘call’ us. And although it felt like a slow process initially he is so secure and happy now overnight so I wouldn’t do it any faster if differently to how we did with hindsight.
It’s also meant we haven’t had a single toilet accident I think because when he was really little we woke as soon as he did, and I think he slept better and deeper knowing we were there.