Here's a GMax tutorial on building an airplane.
It should help you get the hang of the program.
http://simviation.com/gryphon/tutorials/gMax_00.htm
On a side note - I know where you're coming from with regards to the nerve damage. I used to be a really fine artist (painting, drawing, sculpting) but a car accident back in 2,000 left me with whiplash and several broken vertebra that resulted in my having severe nerve damage in my hands. I turned to CG so that I could continue to be creative and because the shaking of my hands wouldn't matter. For people with conditions similar to ours CG is a perfect place to remain an artist.
