Hi,
It all depends on what you want to do! but in general to use MStudio the best way is to select a NI Measurement Studio AppWizard this way you will have all the classes for the MStudio components to gether with a dilog based MFC application.
The ClassWizard will help you create classes for the components of your user interface, you can use it with the MStudio components just the same way that you use it with any control in VC++.
If you go to the start menu and programs you should see under National Instruments a link for MStudio where you can access the help file with all the information on the components and classes. However for specific tasks or questions the best way is to use http://www.ni.com/support.
Good luck!
Regards,
Juan Carlos
N.I.