Hi,
It is not so easy to learn any ERP when you have not experience. But, if you are technical guy, I suppose to start with some development training.
Now, some advices:
AX is to hard for learning if you have not any ERP knowledge.
If you are from Europe, try with NAV. If you are from US, try with GP (or NAV).
CRM is not ERP. But, if you want it, you can also try with Dynamics CRM.
I am sure that some course will not help you so much to get a ERP job. Except courses, you have to learn and train it more and more. Some company will employee you only if you have some knowledge, not course (or exam).
You have to know some functional modules, because you can not be only technical guy in ERP software, because ERP is not IT; ERP is software for business processes.
If you need advice where to go on some good course, you must tell me where you living.