I've posted this many times (as have others), but you do it the same way people who foster adult dogs do (which isn't all that different than puppies).
Regardless of how fancy his bloodlines are, he's an adolescent who's lived a kenneled life. That's how you need to think of him at first. He knows nothing of your house, your rules, or your expectations. He's a lot like a shelter dog coming into a new foster home, having never lived inside a home! He will know nothing
about house living -- bumping into sliding glass doors, taking stuff that's not his, counter surfing, exploring the trash and laundry, not knowing what the TV or garbage disposal sounds are. (Diaper pails and used cat litter are the jackpot of all jackpots!)
For this reason, please consider doing a two-week shut down. It's been posted about and discussed a lot here, but he's the sort of dog that most benefits from it. Here's a link to a document with a good explanation: http://www.bigdogsbighearts.com/2_week_shutdown0001.pdf
As for house training: Put him on a leash in the house. Attach the leash to yourself. If he's never loose in the house without being leashed for at least a week (maybe two!), he can't have house training accidents or mistakenly get into stuff (like the trash). Otherwise put him in the crate.
If you let him roam the house on his own, there will
be piles dropped and legs lifted, and once that starts, it's harder to fix than if it never starts. The goal is to set him up for success so that he's always in the right place to potty, and he gets lots of praise for it. He doesn't know you, so you haven't really earned a right to correct him as you have no relationship at all -- you're a total stranger and your corrections will be weird (and possibly scary or annoying). You'll build a solid relationship with lots of praise and rewards in the beginning, and setting him up for success for everything by putting him in the right place at the right thing to do what you want. That way, corrections will mean something to him later -- always teach the right thing first, and reinforce it with rewards, instead of starting out with "no, no, bad dog" with a dog that knows literally nothing at all.
Take him out every couple of hours, and ALWAYS after waking up (even from naps), and after meals. Stay out at least 15 minutes, and let him off leash (unless you need him to be a leash-pooper on the go -- in which case, get him used to that right away).
When he pees or poops, act like the happiest human that ever lived -- praise, praise, praise. Keep doing this all week, and you'll have a potty trained dog.
If he starts to lift a leg inside, give a quick verbal interruption (ah-ah!) to break him off, rush him outside, and praise outside. Notice I didn't say "correction" -- we're just surprising the dog to interrupt the leg lift in progress, and taking him out. (I don't "correct" accidents in the house because I don't want to accidentally create a dog that's afraid to do it's business in front of me (they're really hard to potty train).)
Clean accidents with enzyme cleaner and get on with life.
DO NOT PUNISH THE DOG FOR ACCIDENTS IN THE HOUSE. ALL ACCIDENTS ARE THE HUMAN'S FAULT FOR NOT PAYING ATTENTION.