Apartment-specific training tips

Hello fellow Redditors,

My wife and I need some pointers (doggy-joke alert).

We are getting a new mini-American/mini-Aussie puppy (Aug 15). We live in a high-rise building so it takes a bit (say, 4-6 min) to go down and out into the nearby grassy areas. Also, this is a high dog-population area so I probably shouldn't take them out before 14wk/vaccinations are done anyway.

We've been trying to read up on basic puppy training things and while we've found amazing resources and a lot of information, I think a lot of it is intended for people who live in houses with backyards with easy access to grass/toilet spots (which, sadly, we do not). We do have a balcony (good) but that has gaps between railings (bad).

Could puppy parents with experience in high-rises/apartments please suggest resources that are more helpful in apartment-specific scenarios? (e.g. topics like starting with p-pads and gradually transitioning to grass etc)

That would be extremely helpful to us as first-time puppy owners. Many thanks in advance for your time and help!