I was more or less the same as you, Java instead of C#. Built some of the apps on http://www.codercowboy.com in a few weeks with help from this book, very highly recommended:

The iOS 5 Developer's Cookbook by Erica Sadun

http://www.amazon.com/The-iOS-Developers-Cookbook-Programmer...

A few (three or four) zero-to-go chapters in about 50 pages, then entire chapters dedicated on various chunks of the IOS objective-c library. Perfect.