How do I construct my own outdoor shed...step by step? What is the simplest way with the supplies I already have.?

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Question by DaynaLee: How do I develop my personal outdoor shed...step by step? What is the easiest way with the supplies I already have.?
I have a grip of aluminum siding...and I have an aluminum shed sitting out in the yard on pallets. I want to tear it down and move it...and of course make it larger. I was hoping to make it with a cement base. But I have no knowledge in construction. I wish it to be 12'x15' or a bit larger. What do I do very

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