I think many, including me, would still consider a six-month old as a puppy. But to some extent, that's immaterial as the same things still apply.
I think the best thing you can do at the start is let the dog find its own level, so to speak. Don't rush it into trying to bond with you, or expect it to want to play with you immediately. Let it take a few days to explore the new environment. But do give it plenty of opportunities to investigate you too. Spend some time on the floor so that you are more approachable and welcoming to the dog.
It is not uncommon for a dog to urinate (and worse) in a new home, even if it's never done it before. Dogs that have been described as having perfect toilet manners and never having chewed anything can sometimes take to both when moving to a new location. It's just their way of coping. If this happens, the only way to deal with it is to smile and clean it up. Shouting at the dog will only serve to stress the dog for longer and thus the behaviour will worsen.
If you're able and it's practical, feed from the hand for a few weeks. I know of absolutely no better way to build a bond and develop trust. It also gives you the opportunity to train little tricks and movements in return for food.
Make sure you know the house-rules before the dog comes home. If you aren't clear about them, then you can't expect the dog to be. Where will he sleep, what toys will he have access to, can he sit on the furniture, can he go upstairs, which room can he have access to, etc. etc.
Don't worry if the dog walks around panting and drinking a lot for the first few days. This is quite normal and indicates the dog is a little stressed at the relocation. It will subside after a couple of days or so, if you give him the time and space to settle. Just make sure there is plenty of water available, and remember that because of the extra fluid intake, he will need more opportunities to relieve himself too.
I'm sure others will give more suggestions, but they are the ones that came to my head as first and foremosts.
Don't forget to enjoy the new addition!
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