Welcome to all the newbies!! I'm a first time dog owner too. Don't know how much of a newbie I'd be considered, since I've been a yorkie mom for a little over a year. My little boy is 2 and I still consider him a pup!
I never thought a tiny ball of fur could make me so happy and so worried all at once.
Feel free to ask away and share more pictures of your babies.
As far as warning when they need to be let out, when Kaji first came home I would ask him "Do you need to go pee pee?" which was always followed with a trip outside. With enough repitetion, he knew what the phrase meant. Now, he will come paw at me, walk to the door then back to me, or something to get my attention. I'll ask "Do you need to go pee pee?" and he'll run and stand by the door as if saying, "Yes please!"
They're smart little guys.
