If you do the pen when you leave, use the pee pads or they might pick a spot on the floor for themselves.
I found working with mine the past 2 weeks that if I dont take her out on a regular schedule, she just picks a spot on the floor and goes. I chose to not go with pee pads since I will be home with her for the first 3 months. But boy, its a lot of work and someone has to be here to let her out. Im sure all this hard work will pay off soon.