The best way is to load the video's from the youtube and try to follow their steps and then start on your case step by step and if you have a problem in one of its selections you can try in the help of the Fluent.
You may find some tutorials on Youtube. There is also one website named "CFD Ninja", there you can find some tutorials. After that you can refer to help of the Ansys.
I think the important thing at learning any software is not to get stuck doing tutorials. Do one or two of them, to get to the very basics, then switch to real problems. There your motivation will be greater and you'll learn much faster, although it may look as a harder way to do it.
The best way is to load the video's from the youtube and try to follow their steps and then start on your case step by step and if you have a problem in one of its selections you can try in the help of the Fluent.