See these for a start
http://blogs.autodesk.com/bim-and-beam/2016/10/18/download-the-dynamo-extension-for-advance-steel/
http://blogs.autodesk.com/bim-and-beam/2017/08/21/how-to-manage-rebar-numbering-with-dynamo/
http://au.autodesk.com/au-online/classes-on-demand/search?full-text=dynamo
http://autodesk.typepad.com