The SDK is references for Makemdl. In that you will find the names to use to name your aircraft parts. Parts have to be named correctly so that animations can be recognized and work in flight sim.
The Resources kit has a gmax file to get you started with making a C-162. The "scene" contains a calibration box that is textured with 3-views of the C-162. The 3-views are in the resources kit folder called UVW.
When you open gmax, you will browse to the resource kit, open the gmax folder and the gmax file for the c162. Later you will setup your file links and browse to the UVW folder for your materials or textures.
There are also reference pictures in the kit along with reference documentation for that aircraft.
If you are just starting with gmax, you will need to go through the tutorials to learn the basic gmax structure and tools. You must have installed gmax, gmax help, and gmax tutorials before you can do those tutorials.
Once done you can start with this project as an exercise to see how things are done. Or, you can start with your own project. If you do that, you will need to read up on Getting Started -Data Collection, Creating a calibration box, and look at the Basics of Gmax video.
I hope this helps.