Rough Draft in Unity Game Engine

Need a functioning design in Unity Game Engine. The rough draft only needs the game level scene, skybox, the terrain (shaped, textured, with trees and grass), the buildings (with functioning doors), the avatar, and being able to "pick up" the two items. 

* Please provide some proof of C# and Unity knowledge*

Do you have extensive knowledge of editing and C# Scripting in Unity Game Engine to be able to create a complete game loop from title screen, to game play, to credits, and back to the title screen!