Get the Ionic book which is mentioned in a sticky thread right at the top of this forum. I found it was the best resource to help me break the ice with Ionic. While it is in beta, it is cheap too!
Apart from that, just create a starter app (as per the guide on the IonicFramework website) and start building your first app. As you come across stumbling blocks, search this forum and StackOverflow.com for an answer - there are plenty out there.
If you can’t find the answer - ask here, and you will generally get a good answer within a day.