welcome to the forum.
You might use WildFly community if you start with JBoss and you are interested in the newest features (i.e. EE7).
The community edition is free to use.
If you use the EAP6.1* downloads it will be a bit different. You might have a look to this page.
The EAP6.1.1.Alpha bits are free to use for devel and production.
The other versions of EAP are not allowed to use in production without a subscription, but you can use it for your development environment for free. This is called a "0$ subscription"
I hope that explanations helps.