Hello! Welcome to the Aruba family. I think you will like what you see :)
In terms of getting training, I would recommend the Mobility boot camp as it will cover a lot of the necessary setup and maintenance tasks of managing our systems.
If you are using Aruba Instant, there is free training at cloud.arubanetworks.com
In terms of getting certified, read and study the Validated Reference Designs (which are also a great source of information) - http://www.arubanetworks.com/technology/reference-design-guides/
I would focus on the Controller, Campus, and 802.11n guides.