There are lots of different ways to start. I recommend going to the library and getting a beginning book or two on Javascript. Once you get past the basic ideas of how to design and debug short programs, try developing a couple simple Javascript enabled web apps for your iPhone. Then move on to basic C programming, then get a very basic introduction to an OOP language such as Smalltalk or Java, then move on to Objective C with Cocoa and UIKit for iPhone app development.
Diving straight into iPhone development is a little like someone who doesn't even know how to boil water trying to home cook a great five course dinner... with a hot date about to arrive in 2 hours. Most likely a recipe for a kitchen disaster.
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