Thank you for your post.
The Development Guide comes with FileMaker Pro 10 Advanced, and there is a chapter dealing with plugins. You can also see this information online at:
Look at Chapter 5 - Developing third-party FileMaker plug-ins.
Thanks, these are good founds! I am having to read these now - gonna tell you, if it all works for me. Maybe a good found for other beginners may be
this guide how to set up Visual Studio Express for FM plugin development.