How to make your own iPhone cases to sell?

It's summer now, and I've been dying for a way to make money. I came up with the idea of creating my own iPhone/iPod cases. Now, what do I need to start? I do have Photoshop to create designs, but where do I download the template to create the designs on the iPhone? And what website is the best for printing and actually making the iPhone case?

Do you have a 'cell case printer'? If you don't or at least a flatbed printer, then you need to go to Zazzle and put your designs there… But don't expect them to sell like hotcakes… There are tons of cell phone cases out there already that are only $2 to $5 a piece!

I sell cases myself, but they're already pre-designed and they are very lovely, example, these are the iPhone 4/4S cases that offer.
http://www.ebay.com/...0904602841

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