Baby registry

I know some places have checklists for your baby registry but I know some of those things I'm not going to need. This is my first baby and I've never really been around baby's before, mainly just children 1 and up.

I'm just wondering what are some things that I will actually need for sure other than clothes, diapers and wipes. I've already bought/been given a ton of clothes in various sizes, and my baby's grandfather works in a food pantry and has been getting me a ton of diapers and wipes from there.

I just don't want to add a bunch of stuff I won't use. Also, is it okay to add post-partum items for myself on there?