Buy a book. Make an app . Release on app store. Dont worry about finding the perfect book, just buy one (I'm partial towards the LaMarche book), work through the examples, then build your own app. IF you run into any hurdles while building your app, google and stackoverflow are your tech support.

I've heard this is a really good introduction book, http://www.amazon.com/Objective-C-Programming-Ranch-Guide-Gu...

Having read their Cocoa programming for OS X book (http://www.amazon.com/Cocoa-Programming-Mac-3rd-Edition/dp/0...), I can wholeheartedly recommend their books.

I've looked at most of the online resources. The best tutorial videos seem to be on Lynda.com. Simon Allardice is really clear and concise in his explanations. The best practice exercises I've found are on Treehouse. The Mobile Makers program mentioned above is really for people who want an immersive program that combines the social, constructive, and cognitive learning methods with mentorship and career opportunities. But I would say, get started with what's online and only commit to a program when you've graduated from curiosity to genuine interest.

Check out the Stanford University iOS classes on iTunes University - very good video resources stepping through all the basic building blocks. Also finding decent open source components on GitHub and alike then manually copying the code is helpful to build up a muscle memory of the API's used