Yes you will need Gmax and the best place to start too, is by working through the official tutorials that you can down load for Gmax.

If you don't have any working knowledge of 3D design programs these tutorials will help you to learn your way around the Gmax GUI. Without doing them first you will encounter sever frustration…You’re going to encounter it anyway.  So take the time to work through the tutorials first. Try not to move ahead in their sequence. There is a progression to them that you can benefit from. By working this way you’ll have a base to refer back to when you need help on a tool.

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