I'm not sure exactly what you are looking for. You have something you want to test? For that test you need some board to provide the I/O for the test? The first thing to do is to define all of the I/O that you need. How many analog inputs/outputs/digital inputs/digital outputs? What is the range of the analog signals you have to source/measure (voltage/current/frequency)? What's your budget? When you have all of that, then you can start looking for test equipment that meets your specifications. You can contact your local NI Sales Engineer for help in configuring a system. For non-NI test equipment, external instruments connected via GPIB/USB/Serial/Ethernet, are usually no problem controlling with LabVIEW. Look for instruments that have drivers already written for them but writing your own driver is always possible. For pc based instruments, ask the vendor if they have a LabVIEW driver. Many do and for the ones that don't, you can usually get documentation in order to write your own. This might require you to use the Call Library Function Node to access a dll that the vendor provides.
There are a lot of tutorials available on the NI web site. You might want to start with http://zone.ni.com/devzone/cda/tut/p/id/4523.
