I migrated our project from JBoss 4/Java 5 to Wildfly 10/Java 8, but what I found was there isn't much different in terms of the configuration  between JBoss 4 and 10. However, the changes between Wildfly 10 and 11 are quite noticeable. You can run a Wildfly 10 configuration on 11, I didn't try it on 12, but I'd presume if you're not using Elytron, it will complain.

So, first thing's first, is you want to make sure if you're using an EAR/WAR, that you remove dependencies that Wildfly already uses, and just make Wildfly wire them in to your project. For example, you mentioned Hibernate. Wildfly comes with Hibernate, so instead of including the hibernate JARs in your lib folder, you'll have your MANIFEST.MF file just have a Dependencies: line for class space. You can find some documentation on integrating Hibernate here: Using latest Hibernate ORM within WildFly

You will want to do this, because wiring in two JARs of the same project can cause collisions with Wildfly. I noticed it a lot with log4J and caused phantom errors.

Second, you're going to want to spec out your integration tests, mostly how things work before, and how things will work with Wildfly.

A lot of this will just be dealing with configuration errors, but it's fairly well documented in their Wildfly 10 documentation. Documentation - WildFly 10 - Project Documentation Editor