New to Core GameKit & Using Playmaker.

The tutorials don't show that you need to set up things in Pool Boss, but the rest is the same. What are the errors you are getting - is it that it isn't set up in Pool Boss? There's a section that shows up where you assign your prefabs saying "this is not configured in Pool Boss" and lets you do it right there without leaving. Do that.

Playmaker usually isn't a factor - meaning it doesn't matter that you're using it, because most of the functionality will not use Playmaker.

Take a look at the Quick Starts on the documentation website, they are up to date and there's a Killable one. But do them in order, they're all short.
www.dtdevtools.com/docs/coregamekit/TOC.htm

You get to the documentation website by clicking the green question mark icons in the Inspectors.