How do you desine a computer game like wolfquest

WolfQuest was made using Unity 3D Pro.
There is a free version of Unity 3D with basic scripts provided, though it lacks many of the Pro features used in WolfQuest. Models were, to my knowledge, designed and animated in Maya (a premium 3D modeling program) and imported to the game engine.

I know you can import 3D models into Unity easily, as I've seen it done commonly with programs like Blender or 3DS MAX as prime examples. If you know how to make a 3D model, rig it and animate it, you should be fine. There are free 3D models scattered around the worldwide web - it's just a matter of finding them, though there are also premium models out there of better quality.

As long as you know how to script in Unity 3D, you should be able to make your own game.