1) Though it seems user friendly, there is no user guide provided by HP.
2) How to start? or what are prerequisites to work with SWF in this tool no info available.
Please help me if anyone knows.
I've issues in this.
This free tool is rather simplistic at heart: enter URL to SWF file, click Analyze, go over results.
The included Help guide should help some, as well as the tool's on-line FAQ: http://h30499.www3.hp.com/t5/The-HP-Security-Laboratory-Blog/HP-SWFScan-FAQ/ba-p/2408387
BTW - In 2011 SWFScan was added the Tools menu and the right-click menu found in WebInspect (version 9.0), but still offers the same light-weight documentation.