How could I debug MIIS rule extension ?

I am newbie of VisualStudio.
We use MIIS and VisualStudio2003 for metaverse rule and MA rule extension.
How could I debug those rule extensions ?

I would like to debug those extension code step by step and understand how the galsync synchronization processes are working.

http://social.technet.microsoft.com/wiki/contents/articles/3991.how-to-debug-your-ilmmiis-provisioning-code.aspx

http://www.wapshere.com/missmiis/debugging-your-extension-code-from-visual-studio

We have test environment of MIIS.

1

Souce code need to exist in MIIS server ?

2

Do I need to set break point to source code and complile by debug mode and put created DLL and pdb file to extension follder ?
3

Where should I set break point to trace all rule extension functions ?