Where to start with making my own 3D mobile puzzle game similar to "The Room"

So here's Fireproof Game's "The Room": https://unity3d.com/showcase/case-stories/fireproof-theroom

It is a great 3D puzzle game for mobile devices, and I am planning on creating maybe a project that would be similar to it, but probably on a much smaller scale since I'm only doing it as a school project with very limited time.

The only problem I'm having with right now is that I am totally lost at where to begin. I have very basic knowledge of Unity3D's interface, and C#/Javascript.

I want to be able to create my own interactive 3D puzzle game for mobile devices when I am done, and I'd be very grateful for some guidance.