Write your own script. If you just use scripts you find on the wiki or in the standard assets you wont gain anything unless you understand how they work. And if you understand how they work you can write your own specifically for what you want to do.
What you want is simple which means you are new. I highly suggest you read up on the Unity API, from then onwards scripting is easy once you get a grasp of it.
In layman's terms for what you want it goes like this:
Place a camera angled above your character. Make your character walk only on the x and z axis, and just get it to follow the character. It is rather simple.
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