Congratulations on your house! We moved from a flat to our house when Castor was 2.5. When we had bought the place, we took Castor there once before we moved in just so that he could have a look - not sure if that was important but we had a really smooth transition. It helped that we didn't really change location - we moved a couple of blocks so Castor new the area even though he hadn't been exactly in this spot before. The fascinating thing was that after we had walked him to our new place that first time, he new the way.
We didn't do anything special apart from spending as much time as possible at home the first months in the new place and to fix the stairs. It was a big change in that we moved from a flat to a townhouse with four floors, so even though Castor was good with stairs before, it took a little while for him to go up and down on his own. The first thing we bought here were actually carpet stair treads, and the first weeks we blocked off the stairs on the top floor where we sleep so he wouldn't fall down if he decided to go sleep-walking.
My advice is to puppy-proof the new place and to be there with him as much as possible. We didn't get any new furniture or anything but just moved our stuff into the new house which I think was good as beds, rugs, and everything else was familiar to Castor. We also didn't change his routines (kept the same schedules as far as possible, same food, etc) although we did start going to a nearby park where he could meet all the dogs in the neighbourhood. That was good for him (and for me as I got to know the neighbours!).
Now, I also think the way we humans responmd to change is important. We were so happy for our house and I think Castror could tell. We have a little patio which was great compared to the small balcony we had before. We moved in late autumn and our gardening activities mainly consisted of trying to clear up what was a very badly kept area. Castor helped out and the following spring when we started laying out our tiny garden, we planned it so that it would be nice for Castor too. So all in all, my advice is to do what you would do anyway but to keep an eye on what Moose might want out of the new house.
Good luck and please tell us how things go!