Are you planning to use VISA or NI-488.2? Is this "regular" VB, or VB.NET?
For NI-488.2 there are several examples that ship with the NI-488.2 drivers that are written in Visual Basic. You should check in the "Program Files\National Instruments\NI-488.2\Languages\Visual Basic" directory.
For VISA there's an example in the "C:\VXIPNP\WinNT\NIvisa\Examples\Vb5\General" directory. You can also look at this
thread.
If you're working in .NET you probably want to install the Measurement Studio support for .NET.