2.5D metroidvania style platformer. I'd like some help.

Ok so i'm incredibly new to unity. I'm actually finding getting into this engine quite cumbersome and a bit tedious. in any case I have a little experience with C#. but its getting into to the engine and actually setting up the plane and figuring out which axis should be confined. some help with setting the positions for the plane would be helpful. My inspiration is coming in the form of Strider for PS4. I have assets and prefabs but i cant figure out for the life of me how to set the terrain and drag and drop these things into the scene please help.

 

This is the best place to start. They have small game tutorials & if you scroll down you will see some more specialised ones.

http://unity3d.com/learn/tutorials