Craig, I am from a structural and civils profession point of view, but before you go creating your own things for RC detailing have a look at the new pre-cast addon for revit 201(has a rc element to it), and also sofistik revit addon as these may be quicker/cheaper wins than creating the same thing.
Also have a look at the new steelwork connections addon as this is a new one for you.
Back on dynamo I would suggest you look at the above posted information and stick to repetitive tasks you do on every project, like the following:
- Project setup
- View/level creation and apply view templates to these
- Drawing sheet creation from excel - see Creating sheets in Revit from Excel
- Model checking/auditing to make sure things are correct prior to analysis transfer?
Once you have the above knowledge you may then be able to look at automatic generation of models if the buildings you are doing are modular/para-metrically similar from architectural information.
Then once at this stage you could possibly start pushing things further for generative design.