If you don't have any CG tools and haven't used them you're probably not ready yet to participate. But, if you're a quick learner, and would like to get involved, you could use open source tools like Blender (which is available here and on the Blender.org site) and other free tools that you can find here and on the web. Also, most companies offer trial versions of their software. For example, Caligari offers a trial version of TrueSpace, NextLimit offers a trial version of Maxwell Render, and most other vendors do also.

Good luck and enjoy!