[Stiglr]

I suggest you get fluent in the terminology of 3D modeling. Learn about what a viewport is, how to navigate, learn what a primitive object is, what a vertice is, what a surface is, what an edge is, what a normal is, what a material is, basic properties of objects and how to manipulate them...

Then learn about the ways to use the features.

So, your #1 job now is to go to the ac3d.org/downloads page and get the User Manual. It's pretty well written, not that initimidating, and fairly complete. Only after you understand the basics of 3D modeling do you have any hope of quickly coming to terms with creating objects as diverse as characters, landscapes and planning for animation/production.

If you're planning to animate these characters, you will need another program to do that: AC3D doesn't handle any animation.