If you have experience with other programming languages, and a basic understanding of what 3d will entail - ie. models built in "modeller", scripts found in the main program, and the level itself as a container for the other items, you could try the "Kingdom Hearts" tutorial under Tutorials on the Acknex Unlimited resource page. I read that, followed the tutorial and found how to use the interface with only a little experimentation while following the tute.

The trickiest thing in the interface is that to find scripts you need to click the "right arrow" at the top left of the "Project" panel that defaults to the left of the level editor interface. This brings up the "Resources" tab, which contains a folder-level view, including all models, scripts etc. in your level.
It seems everything here can be previewed/ opened with a double click on the item.

The best way to learn the interface of 3D GameStudio is possibly to open a sample project from one of the AU magazines and look through the resources.

Don
have a great day