If you want to make hard surface models such as vehicles or robots, the rigging is much easier (in some respects) than rigging an organic or soft bodied model such as a human or clothing.

The first step is to get a modelling app and learn how to use it.  Blender is a free one as mentioned above, there are several others, such as Anim8or and Wings3d.  All of them have tutorials and they are (for the most part) relatively easy to learn.  I use Wings because I find it the most intuitive.  Sure, you can buy Lightwave, Maya or 3DS Max but unless you have a specific aim which can't be achieved with the free packages, there's not much point.

Coppula eam se non posit acceptera jocularum.

My Store

My Gallery