I used StormC 3 to learn C programming on Amiga. That was few years ago when I had my A1200... StormC got fairly good IDE and is very good for beginner. Integrated debugger works in MorphOS also.

Then bad news: StormC 3 generates bad code. There is no optimizer, code generators got few bugs which leads into bad code, and IDE crashed during startup on my A1200 sometimes. If possible try getting StormC 4. It generates better code.

Never tried Storm Wizard but I think it came with StormC 4 only. GUI generated by this wizard would work on AmigaOS 3.5/3.9 only (IIRC). Better stick to ClassAct or MUI (latter is easier to use).