If you are serious about developing, you need to invest in a Mac. As the iPhone is a product of Apple, it uses a variation of the Mac OS. Since iPhone development tools are only available to Mac users, you will likely need a Mac to get it into the iTunes store. I've used the SDK on PC's and it's just not comparable to running it on my iMac. The interfaces and overall structure really can't keep up and the integrations are weird.
The iOS programming guide explains how to implement the features of the iPad into your app. You can also use the iOS Human Interface which will help you to design a great user experience. There is sample code available so that you understand how to properly build your app using their technology. This is a HUGE improvement from the original Apple iPhone developer kit releases and actually makes it feasible to get up and running in one day. Mess around with it and understand how the interface works, along with functionality like swiping, user interface, and speed.
http://rhinomob.com/
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