Congrats on both.
Never owned a Great Dane but my next door neighbor did.
I spent a lot of time with him.
Great dogs.
As for advice, yeah:
Get a BIG pooper scooper.
Get him housebroken ASAP as otherwise, you'll remind me of the joke, read "Yellow River", by I P Daily.
Buy the BIG bags of food, often.
Kidding aside, enjoy the new puppy and new friend for life.