When we got ours we were adviced to keep them in one room for the first week (mainly because the boy was so shy he might hide if given free run of the house )
They should give you something like his blanket . He'll choose where he sleeps .
Food and water away from the litter tray
Find out what he eats now and what litter and keep with that till he settles
Let him potter about and get his paws under your table
Routine - animals thrive on toutine it keeps them secure
And you'll be The Mad Cat Woman standing in Sainsbury muttering " they've only got chicken, they don't like chicken. Ohh Dreamies ..."
Hopefully they'll have enough details from his previous home .
Welcome to your new life Salem 