NI-VISA has absolutely nothing to do with a DAQ device. You will need to use an actual programming language (LabVIEW, C/C++, VB, etc.) with the DAQmx driver.
You are also going to have to design your own circuit to provide the 25V offset. I don't think the DAQ card can do that.
When you've selected a programming language and installed the DAQmx driver, you should also have some programming examples installed.