introducing pets to your newborn!

I'm 35 weeks with my first and my husband and I have 2 friendly cats (7 & 3 years old) and an extremely lovable and social golden retriever (1 1/2 years old). I'm trying to find recommendations for how to introduce them to our son when he gets here so there isn't a huge upset with them. We've let them explore the nursery so that it becomes familiar and not a new experience when he's here but we are looking for any other tips or hints on how to keep them happy and our son safe while they learn to co habitat with each other!