How do I introduce my new guinea pig to all my animals?

I'm getting a baby girl guinea pig in 1 week 5 days (hehe, im excited!!), I have two other girl guinea pigs, a small dog that could not hurt a fly if she wanted to, and two cats. The cats don't hurt my guinea pigs I have now, and they have an open top C&C cage. So how to I introduce my new piggy to all of my animals??