Can I come in pick out a dog and bring him/her home the first day Also are some of the dogs house trained?

Paperwork, interview and you need to have everyone in household come to meet animal. If you rent you need to bring proof pets are allowed. They also require atleast a day I believe they call and do a check on your current pets if you have any

Paperwork and an interview are required.

I don't know sorry I have always been more of a cat person. But I don't think that you can take them out first day because I believe you need paperwork. Some of them may be house trained.