You might want to start with the Dynamic Insert Demo.
Open Help->Example Finder, Select the Search Tab, and keyword 'Menus'. Then select the Dynamic Insert Demo.
For LabView 8.5 with normal installation it is located here.
C:\Program Files\National Instruments\LabVIEW 8.5\examples\general\menubars.llb\Dynamic Insert Demo.vi
It will show how to dynamically add menu items to your runtime menu.
How you handle the .ini is a matter of preference.
How you respond to the menu selection is dependent on what you want to happen with the menu selection. (Launch a program, open a window, etc.) But a good start for that is also on the Example Finder, select the Menu-Selection with Events example.
Jon D
Certified LabVIEW Developer.