There are none. Well, you need to be able to read and know how to use a computer. But other than that just install Qlikview and start learning. Here are three links to resources to get you started:
If you want just use QV to load some excel files, and show some nice charts, there aren't really many prerequisits.
Download the software, the tutorial and start.
If you want to set up the QV server, integrate it in a complex IT infrastructure or create extensions, you probably need to have some experience in fields like IT infrastructure or programming languages.
Also creating more complex data models might require that you have some experience, either already learned, or learn it while you go forward.
