On both occasions we have had puppies I have sent some towels to the breeder well in advance of collecting the pup so that they can absorb the smell of the pup's first 'home' and have then put the a towel in the puppy's bed for comfort - seemed reasonably successful. Did something similar when Alice came to live with us aged 5 - her breeder and previous 'mummy' let her come with a piece of vetbed and a precious cuddly toy - and again, she settled very quickly.
HTH.
As for collar/lead, PAH straightforward webbing sort where there are no holes, you just stick 'prong' thing through to fit? Once he was a little bigger went on to traditional rolled leather, available from good petshops.