The best way is to go through the documentation and to do the installation. The key is to understand the architecture of AIA. EBOs, EBSs and etc. There is some tooling that Oracle has built that's part of AIA that helps define a lifecycle approach to doing application integration.
I would suggest you to go through the below link
This link contains the documentation as well as the samples of AIA Fusion Order Demo. This will definelty help u in understanding the concepts of AIA easier.