Thank you for taking a rescue dog and giving him a forever home.
The best advice I can give is to make sure you have a place for him to rest and call his own space, somewhere quiet that he can go to to sleep and if he is scared. Do this before you bring him home so you can show him his 'bed' straight away.
Show him the garden and remember to praise him when he does his business, just voice commands though.
Finally leave him to it! Don't try, yourself or anyone else, to shower him in love. He needs to settle and will come to you when he is ready, it may take hours, days or weeks, but it will happen.
Good luck
Lisa x
ps, please disregard all of the above if he runs in and jumps straight on your lap for cuddles ;0)