I think the best way to get free training related to iPad hardware/software is to train yourself using a free iBook called The Student Guide to iPads and iOS6, written byJan de Haan. The book was created in 2012 to support a one-to-one middle school iPad implementation and it contains all the basics that you need to know. If you download the book onto your iPad, you and or your students can refer to it when needed.
However, I have put together the slide show below about the basics in order to assist teachers familiarise themselves with their new iPad.
iPad basics from j_villis