Do I need to have our documents notarized for the AOS/EAD/AP Package we’re supposed to send out to USCIS?

No, you don’t have to have your documents notarized unless otherwise instructed by an Immigration/Consular Officer. But you can if you wanted to. It’s not required but if you think it’s better to send in notarized documents to prove its authenticity, go ahead. Banks in the U.S., especially if you’re their banking client offer this for free. At least, Wells Fargo does. Some bankers have Public Notary licenses.