Help! Just adopted a dog as a new dog owner and need advice.

So my wife and I just adopted a 1 year old shepherd/lab mix from Azerbaijan and picked her up from the airport last night. She’s a very sweet girl, but to be perfectly honest, we are overwhelmed trying to figure out how to care for her. We walk her 3 times a day, even in the cold weather in the northeast, but she never goes to the bathroom outside the house. The foster in Azerbaijan told us she did indeed go to the bathroom during walks, but that she occasionally would have accidents in the house. We put wee-wee pads wherever she peed in our apartment but we are honestly in over our heads. How do we get her on a regular schedule for eating and walking, and get her peeing/pooping during her walks? We both work full time (me 9 am – 6 p),so any advice would be greatly appreciated