@DarrenOP
Any guides listing the Amiga API set and guidelines?
Get the DevCD 2.1, it contains everything you need to program AmigaOS up to 3.5, including the RKRMs (for 2.04) and Includes and AutoDocs and examples. You also get a version of StormC included for non-commercial use.
Failing that, wait for OS4 as the APIs etc will be updated, and there will be a new NDK. I have also heard that they are planning to update the RKRMs to cover OS4.0, which will be well worth getting hold of.
There won't be any major differences between coding for 3.x and 4.0 though.
Chris