This is the crate we bought for Wrigley:
http://www.petsmart.com/global/produ...Text=crate&N=2
We bought this when we brought her home at 12 weeks and she weighed 1.13lbs and she's now 9 1/2 months and weighs 4.11. She loves it and sleeps in it at night. We have the smallest size and it's enough room for her to go in, turn around and sleep. When we are gone during the day, we put it in a baby playpen without the door and pee pee pads.
I would recommend if you have the room to put it in an x-pen or metal cage. If you do a search on here, you will find pictures of set-ups different people have for their dogs.
We use both the reusable and disposable pads. We use the reusable in the car and her playpen, the disposable in her litter box.
Congrats and good luck!